2025/03/27 更新

写真a

アキタ ミツル
秋田 充
Akita Mitsuru
所属
大学院農学研究科 生命機能学専攻 准教授
職名
准教授
連絡先
メールアドレス
外部リンク

学位

  • 農学修士 ( 東京大学 )

  • 博士(農学) ( 東京大学 )

研究キーワード

  • Chloroplast

  • Transporter

  • Molecular Chaperone

  • 二次代謝

  • 輸送蛋白質

  • 葉緑体

  • 分子シャペロン

  • 蛋白質の局在化

  • Protein Targeting

研究分野

  • ライフサイエンス / 応用生物化学

学歴

  • 東京大学   農学系研究科   農芸化学

    - 1993年

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    国名: 日本国

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  • 東京大学

    - 1993年

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  • 東京大学   農学系研究科   農芸化学専攻

    - 1990年

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    国名: 日本国

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  • 東京大学

    - 1990年

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  • 東京大学

    - 1988年

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  • 東京大学   農学部   農芸化学

    - 1988年

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    国名: 日本国

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経歴

  • 愛媛大学

    2001年 - 現在

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  • Ehime University, Faculty of Agriculture

    2001年 - 現在

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  • Michigan State University, MSU-DOE Plant Research Laboratory, USA

    1994年 - 2001年

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  • 米国ミシガン州立大学エネルギー省植物研究所

    1994年 - 2001年

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  • 東京大学応用微生物学研究所

    1992年 - 1994年

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  • The University of Tokyo, Institute of Applied Microbiology

    1992年 - 1994年

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所属学協会

論文

  • ppGpp inhibits peptide elongation cycle of chloroplast translation system in vitro. 査読

    Yuhta Nomura, Taito Takabayashi, Hiroshi Kuroda, Yasushi Yukawa, Kwanchanok Sattasuk, Mitsuru Akita, Akira Nozawa, Yuzuru Tozawa

    Plant Molecular Biology   78 ( 1-2 )   185 - 196   2012年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1007/s11103-011-9858-x

    PubMed

    J-GLOBAL

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    その他リンク: http://link.springer.com/article/10.1007/s11103-011-9858-x/fulltext.html

  • In Vitro Protein Import of a Putative Amino Acid Transporter from Arabidopsis thaliana into Chloroplasts and Its Suborganellar Localization 査読

    Kwanchanok Sattasuk, Akira Nozawa, Yuzuru Tozawa, Yoshimi Kakinuma, Mitsuru Akita

    BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY   75 ( 11 )   2200 - 2206   2011年11月

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS LTD  

    We identified a gene product of At5g19500 (At5g19500p) from Arabidopsis thaliana that is homologous to EcTyrP, a tyrosine-specific transporter from Escherichia coli. Computational analyses of the amino acid sequence of At5g19500p predicted 11 transmembrane domains (TMDs) and a potential plastid targeting signal at its amino terminus. As a first step toward understanding the possible role of At5g19500p in plant cells, we attempted to determine the localization of At5g19500p by an in vitro chloroplastic import assay using At5g19500p translated in a cell-free wheat germ system (Madin etal., Proc. Natl. Acad. Sci. USA, 97,559-564 (2000)), followed by subfractionation of the chloroplasts. At5g19500p was successfully imported into chloroplasts, and the newly transported mature form of At5g19500p was recovered from the inner envelope membrane.

    DOI: 10.1271/bbb.110489

    Web of Science

    PubMed

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  • In Vitro Fluorescent Analysis of Preprotein Import into Chloroplasts 査読

    Sattasuk Kwanchanok, Hitoshi Inoue, Mitsuru Akita

    BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY   75 ( 10 )   2001 - 2007   2011年10月

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS LTD  

    Despite recent progress in fluorescence techniques employed to observe protein localization in living cells, the in vitro chloroplastic protein transport assay remains a useful tool for determining the destinations of proteins. Although an in vitro synthesized, radiolabeled precursor protein is frequently used as the transport substrate, we have developed a transport assay system with a non-radiolabeled precursor protein that carries an epitope tag and is overexpressed in Escherichia coli. Thus, a transported protein can be detected by immunoblotting (Inoue et al., Plant Physiol. Biochem., 46, 541-549 (2008)). Here, we propose another in vitro protein transport system that combines fluorescence techniques. We attempted to use two types of precursors: a green fluorescent protein (GFP)-fused precursor and a fluorescent dye-labeled one. Both were successfully imported into chloroplasts. However, the fluorescent dye-labeled precursor was more advantageous than the GFP-fused precursor in the in vitro system.

    DOI: 10.1271/bbb.110438

    Web of Science

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  • EVALUATING THE ENERGY-DEPENDENT "BINDING" IN THE EARLY STAGE OF PROTEIN IMPORT INTO CHLOROPLASTS 招待 査読

    Mitsuru Akita, Hitoshi Inoue

    METHODS IN ENZYMOLOGY, VOL 466: BIOTHERMODYNAMICS, PT B   466   43 - 64   2009年

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:論文集(書籍)内論文   出版者・発行元:ELSEVIER ACADEMIC PRESS INC  

    During protein import into chloroplasts, precursor proteins are synthesized in the cytosol with an amino-terminal extension signal and irreversibly bind to chloroplasts under stringent energy conditions, such as low levels of GTP/ATP and low temperature, to form the early translocation intermediates. Whether the states of the early-intermediates that are formed under different energy conditions are similar has not been well studied. To evaluate the early intermediate states, we analyzed how precursor proteins within the early intermediates behave by employing two different approaches, limited proteolysis and site-specific cross-linking. Our results indicate that three different combinations of three different early intermediate stages are present and that the extent of precursor translocation differs between these stages based upon temperature as well as hydrolysis of GTP and ATP. Furthermore, the transition from the second to the third stage was only observed by increasing the temperature. This transition is also accompanied by the hydrolysis of ATP and the movement of the transit peptide. These results suggest the presence of temperature-sensitive and temperature-insensitive ATIP-hydrolyzing steps during the early stages of protein import.

    DOI: 10.1016/S0076-6879(09)66003-1

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  • Alternative Processing of Arabidopsis Hsp70 Precursors during Protein Import into Chloroplasts 査読

    Ratnayake R. M. Udayangani, Inoue Hitoshi, Nonami Hiroshi, AKITA Mitsuru

    Bioscience, biotechnology, and biochemistry   72 ( 11 )   2926 - 2935   2008年11月

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Japan Society for Bioscience, Biotechnology, and Agrochemistry  

    During protein import into chloroplasts, one of the Hsp70 proteins in pea (Hsp70-IAP), previously reported to localize in the intermembrane space of chloroplasts, was found to interact with the translocating precursor protein but the gene for Hsp70-IAP has not been identified yet. In an attempt to identify the Arabidopsis homolog of Hsp70-IAP, we employed an <I>in vitro</I> protein import assay to determine the localization of three Arabidopsis Hsp70 homologs (AtHsp70-6 through 8), predicted for chloroplast targeting. AtHsp70-6 and AtHsp70-7 were imported into chloroplasts and processed into similar-sized mature forms. In addition, a smaller-sized processed form of AtHsp70-6 was observed. All the processed forms of both AtHsp70 proteins were localized in the stroma. Organelle-free processing assays revealed that the larger processed forms of both AtHsp70-6 and AtHsp70-7 were cleaved by stromal processing peptidase, whereas the smaller processed form of AtHsp70-6 was produced by an unspecified peptidase.

    DOI: 10.1271/bbb.80408

    CiNii Books

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  • The transition of early translocation intermediates in chloroplasts is accompanied by the movement of the targeting signal on the precursor protein 査読

    Hitoshi Inoue, Mitsuru Akita

    ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS   477 ( 2 )   232 - 238   2008年9月

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE INC  

    During protein import into chloroplasts, precursor proteins are docked to these organelles under stringent energy conditions to form early translocation intermediates. Depending on the temperature and the requirement for ATP, different types of early-intermediates are present, for which the extent of precursor protein translocation differs [H. Inoue, M, Akita, J. Biol. Chem. 283 (2008) 7491-7502]. However, it has not been determined whether the environment Surrounding the precursor differs for each intermediate. We therefore employed a site-specific photo-crosslinking strategy in Our current Study to capture any components in close proximity to the targeting signal of the precursors within the early-intermediates. Various crosslinked products, one of which contains Toc75, were identified. The appearance of these products was found to be dependent on the position of the precursor upon modification by the crosslinker and also the intermediate state. This indicated that the transition of early translocation intermediates is accompanied with the movement of the targeting signal within the early-intermediates. (C) 2008 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.abb.2008.06.007

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  • Development and optimization of an in vitro chloroplastic protein import assay using recombinant proteins 査読

    Hitoshi Inoue, R.M. Udayangani Ratnayake, Hiroshi Nonami, Mitsuru Akita

    Plant Physiology and Biochemistry   46 ( 5-6 )   541 - 549   2008年5月

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    The in vitro protein import experiment is one of the most important techniques for determining protein localization. For chloroplastic proteins, proteins of interest are incubated with isolated chloroplasts in the presence of energy sources. Radio-labeled proteins synthesized either in vitro or in vivo have been widely used as substrate proteins. Here we report our development of the protein import assay system in which non-radio-labeled proteins, overexpressed in Escherichia coli, were applied. In this system, substrate proteins were designed to carry epitope-tags, thus allowing analysis of imported proteins by SDS-PAGE, followed by immunoblotting to detect these tags. Furthermore, the imported proteins were found to be incorporated into their native form. These observations indicated that recombinant proteins were imported into chloroplasts and folded correctly. Therefore, this assay system could represent another valuable tool for determining protein localization. © 2008 Elsevier Masson SAS. All rights reserved.

    DOI: 10.1016/j.plaphy.2008.02.007

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  • Three Sets of Translocation Intermediates Are Formed during the Early Stage of Protein Import into Chloroplasts 査読

    Hitoshi Inoue, Mitsuru Akita

    Journal of Biological Chemistry   283 ( 12 )   7491 - 7502   2008年3月

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Society for Biochemistry & Molecular Biology (ASBMB)  

    During the early stage of protein import into chloroplasts, precursor proteins synthesized in the cytosol irreversibly bind to chloroplasts to form the early translocation intermediate under stringent energy conditions. Many efforts have been made to identify the components involved in protein import by analyzing the early intermediate. However, the state of the precursor within the intermediate has not been well investigated so far. In this study, an attempt was made to evaluate the extent of translocation of the precursor by determining the state of the precursor in the early intermediate under various conditions and analyzing the fragments generated by limited proteolysis of the precursors docked to chloroplasts. Our results indicate that three different sets of early intermediate are formed based on temperature and the hydrolysis of GTP/ ATP. These have been identified based on the size of proteolytic fragments of the precursor as "energy-dependent association," "insertion," and "penetration" states. These findings suggest two individual ATP-hydrolyzing steps during the early stage of protein import, one of which is temperature-sensitive. Our results also demonstrate that translocation through the outer envelope membrane is mainly dependent on internal ATP.

    DOI: 10.1074/jbc.m709571200

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  • Kunitz Soybean Trypsin Inhibitor is Modified at its C-terminus by Novel Soybean Thiol Protease (Protease T1) 査読

    Makoto Sugawara, Daisuke Ito, Mitsuru Akita, Suguru Oguri, Yoshie Momonoki

    Plant Production Science   10 ( 3 )   314 - 321   2007年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Informa UK Limited  

    Kunitz soybean trypsin inhibitor (KSTI) is hydrolyzed during seed germination to yield amino acids needed to support initial seedling growth. The type of KSTI from Glycine max (L.) Merrill cv. Toyokomachi is KSTI-Ti-b The KSTI-Ti-b from 4-day-old post-germination cotyledons (KSTI-Ti-b) has 3 or 4 amino acid residues cleaved off at the C-terminus. This KSTI modification is important to understand the mechanism of degradation in seed reserve proteins by proteases. Protease KI also cleaves amino acid residues at the C-terminus of KSTI but it removes 5 amino acid residues. Therefore, we presumed the KSTI-Ti-b was produced by a protease other than protease KI. In this study, the protease TI responsible for cleavage of KSTI-Ti-b at the C-terminus was purified. The enzyme was estimated to have a molecular mass of 33 kDa from its mobility on SDS-PAGE gels. The N-terminal amino acid sequence of the purified protease TI corresponded to amino acids Phe-73 to Phe-92 of both thiol protease isoforms A and B from the soybean leaf, and shared 83% identity with the partial amino acid sequence of the membrane-associated cysteine protease from mung bean seedlings, a protease known to perform post-translational cleavage of C-terminal peptides of target proteins. Finally, this enzyme was shown to convert KSTI-Ti-b to KSTI-Ti-b.

    DOI: 10.1626/pps.10.314

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  • Stimulation of transit-peptide release and ATP hydrolysis by a cochaperone during protein import into chloroplasts 査読

    Ming-Lun Chou, Chiung-Chih Chu, Lih-Jen Chen, Mitsuru Akita, Hsou-Min Li

    Journal of Cell Biology   175 ( 6 )   893 - 900   2006年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Three components of the chloroplast protein translocon, Tic110, Hsp93 (ClpC), and Tic40, have been shown to be important for protein translocation across the inner envelope membrane into the stroma. We show the molecular interactions among these three components that facilitate processing and translocation of precursor proteins. Transit-peptide binding by Tic110 recruits Tic40 binding to Tic110, which in turn causes the release of transit peptides from Tic110, freeing the transit peptides for processing. The Tic40 C-terminal domain, which is homo logous to the C terminus of cochaperones Sti1p/Hop and Hip but with no known function, stimulates adenosine triphosphate hydrolysis by Hsp93. Hsp93 dissociates from Tic40 in the presence of adenosine diphosphate, suggesting that Tic40 functions as an adenosine triphosphatase activation protein for Hsp93. Our data suggest that chloroplasts have evolved the Tic40 cochaperone to increase the efficiency of precursor processing and translocation. © The Rockefeller University Press.

    DOI: 10.1083/jcb.200609172

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  • Early steps in the biosynthesis of NAD in Arabidopsis start with aspartate and occur in the plastid 査読

    Akira Katoh, Kazuya Uenohara, Mitsuru Akita, Takashi Hashimoto

    PLANT PHYSIOLOGY   141 ( 3 )   851 - 857   2006年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER SOC PLANT BIOLOGISTS  

    NAD is a ubiquitous coenzyme involved in oxidation-reduction reactions and is synthesized by way of quinolinate. Animals and some bacteria synthesize quinolinate from tryptophan, whereas other bacteria synthesize quinolinate from aspartate ( Asp) using L-Asp oxidase and quinolinate synthase. We show here that Arabidopsis ( Arabidopsis thaliana) uses the Asp-to-quinolinate pathway. The Arabidopsis L-Asp oxidase or quinolinate synthase gene complemented the Escherichia coli mutant defective in the corresponding gene, and T-DNA-based disruption of either of these genes, as well as of the gene coding for the enzyme quinolinate phosphoribosyltransferase, was embryo lethal. An analysis of functional green fluorescent protein-fused constructs and in vitro assays of uptake into isolated chloroplasts demonstrated that these three enzymes are located in the plastid.

    DOI: 10.1104/pp.106.081091

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  • Identification of three shikimate kinase genes in rice: characterization of their differential expression during panicle development and of the enzymatic activities of the encoded proteins 査読

    K Kasai, T Kanno, M Akita, Y Ikejiri-Kanno, K Wakasa, Y Tozawa

    PLANTA   222 ( 3 )   438 - 447   2005年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPRINGER  

    The shikimate pathway is common to the biosynthesis of the three aromatic amino acids and that of various secondary metabolites in land plants. Shikimate kinase (SK; EC 2.7.1.71) catalyzes the phosphorylation of shikimate to yield shikimate 3-phosphate. In an attempt to elucidate the functional roles of enzymes that participate in the shikimate pathway in rice ( Oryza sativa), we have now identified and characterized cDNAs corresponding to three SK genes-OsSK1, OsSK2, and OsSK3-in this monocotyledenous plant. These SK cDNAs encode proteins with different NH2-terminal regions and with putative mature regions that share sequence similarity with other plant and microbial SK proteins. An in vitro assay of protein import into intact chloroplasts isolated from pea ( Pisum sativum) seedlings revealed that the full-length forms of the three rice SK proteins are translocated into chloroplasts and processed, consistent with the assumption that the different NH2-terminal sequences function as chloroplast transit peptides. The processed forms of all three rice proteins synthesized in vitro manifested SK catalytic activity. Northern blot analysis revealed that the expression of OsSK1 and OsSK2 was induced in rice calli by treatment with the elicitor N-acetylchitoheptaose, and that expression of OsSK1 and OsSK3 was up-regulated specifically during the heading stage of panicle development. These results suggest that differential expression of the three rice SK genes and the accompanying changes in the production of shikimate 3-phosphate may contribute to the defense response and to panicle development in rice.

    DOI: 10.1007/s00425-005-1559-8

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  • Hydraulic conductance in tepal growth and extension of vase life with trehalose in cut tulip flowers 査読

    H Wada, M Iwaya-Inoue, M Akita, H Nonami

    JOURNAL OF THE AMERICAN SOCIETY FOR HORTICULTURAL SCIENCE   130 ( 2 )   275 - 286   2005年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER SOC HORTICULTURAL SCIENCE  

    Two cultivars of tulip (Tulipa gesneriana L.) were used to check the effect of trehalose-feeding on longevity of vase life. 'Oxford' plants were grown from bulbs, and trehalose-fed cut flowers were compared with the intact plants grown in pots. 'Pink Diamond' flowers were obtained commercially as cut flowers from the market, and trehalose-feeding was examined by using only flower parts. In both cultivars of plants, it was confirmed that trehalose-feeding enhanced longevity of the vase life significantly at room temperature. Additionally, mechanisms of prolonging the vase life with trehalose-fed flowers were studied by comparing the water status in the zone of elongation of tulip tepals when their growth rates were modified with different treatments. In the elongating region of tulip tepals, cell elongation rates were linearly correlated to sizes of the growth-induced water potential regardless of treatments. It was found that trehalose-feeding reduced the hydraulic conductance, resulting in a decrease in cell elongation rates. Also, trehalose helped to maintain turgor of tepal cells for longer periods. Furthermore, trehalose enhanced pigmentation in tepals, and thus, trehalose is believed to have had a role in altering the metabolism in elongating cells and in reducing hydraulic conductivity in membranes.

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  • Direct Measurements of Cell Turgor and Hydraulic Conductance in Expanding Tulip Tepals 査読

    和田 博史, 井上 眞理, 秋田 充, 野並 浩

    生物環境調節   42 ( 3 )   205 - 215   2004年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists  

    本研究は, 生長中のチューリップ花弁において生長と水分特性の関連性を明らかにすることを目的に行った.外花被片の細胞伸長速度をエクステンショメーターにより, 伸長部位における表皮細胞の膨圧はプレッシャープローブを用いて計測した.膨圧計測後の組織から細胞溶液を抽出し, 細胞溶液の浸透ポテンシャルを等圧式サイクロメーターにより計測した.表皮細胞の水ポテンシャルは膨圧と浸透ポテンシャルの和から求めた.ショ糖処理によりチューリップ花弁の細胞伸長速度が増大し, トレハロース処理により細胞伸長速度が低下した.定常状態に達したときの相対生長率を生長に伴った水ポテンシャルで割ることにより, 非破壊の花弁組織において水コンダクタンスを算出したところ, トレハロース供与によって花弁の水コンダクタンスが有意に低下することが明らかとなった.

    DOI: 10.2525/ecb1963.42.205

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  • Hydraulic Conductance Associated with Growth of Flower Stalks, Leaves and Roots in Tulip Plants 査読

    和田 博史, 井上 眞理, 秋田 充, 野並 浩

    生物環境調節   42 ( 3 )   193 - 203   2004年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists  

    低温処理後のチューリップの根, 葉, 茎の伸長の制御機構について水分生理学的に解明を行った.定植までに経た低温前歴が短いほど, 定植後の各組織において生長速度が低下した.細胞伸長時の花茎の維管束の分化と発達を観察したところ, 維管束形成には低温前歴の関与が認められなかったため, 各組織の生長速度の差異は細胞伸長速度の低下のみに依存していることが明らかになった.相対生長率と生長に伴った水ポテンシャルを計測すると, すべての処理区において正の相関関係が認められ, 各組織の生長速度の低下に水コンダクタンスの低下が関与していることが示唆された.以上の結果から, チューリップの各組織の生長速度は細胞伸長速度に依存しており, 細胞伸長時には生長に伴った水ポテンシャル勾配が形成され, 水コンダクタンスの大きさによって生長速度が制御されていることが明らかになった.

    DOI: 10.2525/ecb1963.42.193

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  • Tic40, a membrane-anchored co-chaperone homolog in the chloroplast protein translocon 査読

    ML Chou, LM Fitzpatrick, SL Tu, G Budziszewski, S Potter-Lewis, M Akita, JZ Levin, K Keegstra, HM Li

    The EMBO Journal   22 ( 12 )   2970 - 2980   2003年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Wiley  

    The function of Tic40 during chloroplast protein import Was investigated. Tic40 is an inner envelope membrane protein with a large hydrophilic domain located in the stroma. Arabidopsis null mutants of the atTic40 gene were very pale green and grew slowly but were not seedling lethal. Isolated mutant chloroplasts imported precursor proteins at a lower rate than wild-type chloroplasts. Mutant chloroplasts were normal in allowing binding of precursor proteins. However, during subsequent translocation across the inner membrane, fewer precursors were translocated and more precursors were released from the mutant chloroplasts. Cross-linking experiments demonstrated that Tic40 was part of the translocon complex and functioned at the same stage of import as Tic110 and Hsp93, a member of the Hsp100 family of molecular chaperones. Tertiary structure prediction and immunological studies indicated that the C-terminal portion of Tic40 contains a TPR domain followed by a domain with sequence similarity to co-chaperones Sti1p/Hop and Hip. We propose that Tic40 functions as a cochaperone in the stromal chaperone complex that facilitates protein translocation across the inner membrane.

    DOI: 10.1093/emboj/cdg281

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  • Molecular chaperones involved in chloroplast protein import 招待 査読

    Diane Jackson-Constan, Mitsuru Akita, Kenneth Keegstra

    Biochimica et Biophysica Acta (BBA) - Molecular Cell Research   1541 ( 1-2 )   102 - 113   2001年12月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    Transport of cytoplasmically synthesized precursor proteins into chloroplasts, like the protein transport systems of mitochondria and the endoplasmic reticulum, appears to require the action of molecular chaperones, These molecules are likely to be the sites of the ATP hydrolysis required for precursor proteins to bind to and be translocated across the two membranes of the chloroplast envelope. Over the past decade, several different chaperones have been identified, based mainly on their association with precursor proteins and/or components of the chloroplast import complex, as putative factors mediating chloroplast protein import. These factors include cytoplasmic, chloroplast envelope-associated and stromal members of the Hsp70 family of chaperones, as well as stromal Hsp100 and Hsp60 chaperones and a cytoplasmic 14-3-3 protein. While many of the findings regarding the action of chaperones during chloroplast protein import parallel those seen for mitochondrial and endoplasmic reticulum protein transport, the chloroplast import system also has unique aspects, including its hypothesized use of an Hsp100 chaperone to drive translocation into the organelle interior. Many questions concerning the specific functions of chaperones during protein import into chloroplasts still remain that future studies, both biochemical and genetic, will need to address. (C) 2001 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/s0167-4889(01)00148-3

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  • The Roles of HSP100/Clp Proteins in Living Organisms.

    秋田 充

    生物環境調節   39 ( 3 )   139 - 148   2001年

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists  

    最近になってその存在が広く知られるようになったHSP100/Clpに属する蛋白質は, 生体内において, 様々な場所で様々な細胞内活動に関わっている.HSP100/Clpに属する蛋白質は, アミノ酸配列の相同性によってさらに細かく分類されるに至っている.それぞれの蛋白質の機能は多岐にわたっており, 例えば, 高温耐性の獲得, 蛋白質分解酵素の酵素活性の促進, 物質輸送等に関与している.分類上同じ蛋白質同士であっても, その蛋白質の由来する生物種が異なれば, その特徴にも差異があったりする.しかし, どのHSP100/Clp蛋白質にも共通の特徴がある.それは, 分子シャペロンとして機能していることである.分子シャペロンとして機能しながら様々な細胞内活動を遂行するためには, ATPを利用する必要がある.

    DOI: 10.2525/ecb1963.39.139

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  • Identification of Protein Transport Complexes in the Chloroplastic Envelope Membranes via Chemical Cross-Linking 査読

    Mitsuru Akita, Erik Nielsen, Kenneth Keegstra

    Journal of Cell Biology   136 ( 5 )   983 - 994   1997年3月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Rockefeller University Press  

    Transport of cytoplasmically synthesized proteins into chloroplasts uses an import machinery present in the envelope membranes. To identify the components of this machinery and to begin to examine how these components interact during transport, chemical cross-linking was performed on intact chloroplasts containing precursor proteins trapped at a particular stage of transport by ATP limitation. Large crosslinked complexes were observed using three different reversible homobifunctional cross-linkers. Three outer envelope membrane proteins (OEP86, OEP75, and OEP34) and one inner envelope membrane protein (IEP110), previously reported to be involved in protein import, were identified as components of these complexes. In addition to these membrane proteins, a stromal member of the hsp100 family, ClpC, was also present in the complexes. We propose that ClpC functions as a molecular chaperone, cooperating with other components to accomplish the transport of precursor proteins into chloroplasts. We also propose that each envelope membrane contains distinct translocation complexes and that a portion of these interact to form contact sites even in the absence of precursor proteins.

    DOI: 10.1083/jcb.136.5.983

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  • Stable association of chloroplastic precursors with protein translocation complexes that contain proteins from both envelope membranes and a stromal Hsp100 molecular chaperone 査読

    E. Nielsen, M. Akita, K. Keegstra

    The EMBO Journal   16 ( 5 )   935 - 946   1997年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Wiley  

    Cytoplasmically synthesized precursors interact with translocation components in both the outer and inner envelope membranes during transport into chloroplasts. Using co-immunoprecipitation techniques, with antibodies specific to known translocation components, we identified stable interactions between precursor proteins and their associated membrane translocation components in detergent-solubilized chloroplastic membrane fractions. Antibodies specific to the outer envelope translocation components OEP75 and OEP34, the inner envelope translocation component IEP110 and the stromal Hsp100, ClpC, specifically co-immunoprecipitated precursor proteins under limiting ATP conditions, a stage we have called docking, A portion of these same translocation components was coimmunoprecipitated as a complex, and could also be detected by co-sedimentation through a sucrose density gradient. ClpC was observed only in complexes with those precursors utilizing the general import apparatus, and its interaction with precursor-containing translocation complexes was destabilized by ATP. Finally, ClpC was co-immunoprecipitated with a portion of the translocation components of both outer and inner envelope membranes, even in the absence of added precursors. We discuss possible roles for stromal Hsp100 in protein import and mechanisms of precursor binding in chloroplasts.

    DOI: 10.1093/emboj/16.5.935

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  • Topology of IEP110, a component of the chloroplastic protein import machinery present in the inner envelope membrane 査読

    J Lubeck, J Soll, M Akita, E Nielsen, K Keegstra

    EMBO JOURNAL   15 ( 16 )   4230 - 4238   1996年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-BLACKWELL  

    Proteins from both the inner and outer envelope membranes are engaged in the recognition and translocation of precursor proteins into chloroplasts, A 110 kDa protein of the chloroplastic inner envelope membrane was identified as a component of the protein import apparatus by two methods, First, this protein was part of a 600 kDa complex generated by crosslinking of precursors trapped in the translocation process. Second, solubilization with detergents of chloroplasts containing trapped precursors resulted in the identification of a complex containing both radiolabeled precursor and IEP110, Trypsin treatment of intact purified chloroplasts was used to study the topology of IEP110. The protease treatment left the inner membrane intact while simultaneously degrading domains of inner envelope proteins exposed to the intermembrane space, About 90 kDa of IEP110 was proteolitically removed, indicating that large portions protrude into the intermembrane space, Hydropathy analysis of the protein sequence deduced from the isolated cDNA clone in addition to Western blot analysis using an antiserum of IEP110 specific to the N-terminal 20 kDa, suggests that the N-terminus serves to anchor the protein in the membrane, We speculate that IEP110 could be involved in the formation of translocation contact sites due to its specific topology.

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  • DETERMINATION OF A REGION IN SECA THAT INTERACTS WITH PRESECRETORY PROTEINS IN ESCHERICHIA-COLI 査読

    E KIMURA, M AKITA, S MATSUYAMA, S MIZUSHIMA

    JOURNAL OF BIOLOGICAL CHEMISTRY   266 ( 10 )   6600 - 6606   1991年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC  

    SecA interacts with presecretory proteins through recognition of the positive charge at the amino terminus of the signal peptide (Akita, M., Sasaki, S., Matsuyama, S., and Mizushima, S. (1989) J. Biol. Chem. 265, 8164-8169). A large variety of amino-terminal and carboxyl-terminal fragments of SecA were prepared in 6 M guanidine hydrochloride. SecA analogues were then reconstituted from them and examined for their ability to cross-link with [S-35]proOmpF-Lpp, a presecretory protein, in the presence of 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide. The reconstituted SecA analogues were active in the cross-linking with proOmpF-Lpp when the SecA fragments used were large enough to structurally complement each other. The cross-linking was signal peptide-dependent and suppressed in the presence of other presecretory proteins. The cross-linking was enhanced in the presence of ATP. The SecA fragments that cross-linked with proOmpF-Lpp were then analyzed on sodium dodecyl sulfate-polyacrylamide gels. The cross-linking preferentially took place on fragments possessing the amino terminus of SecA. Weak cross-linking was also observed with carboxyl-terminal fragments when they were large enough. The smallest amino-terminal and carboxyl-terminal fragments with which the cross-linking was observed were 39 and 72 kDa, respectively. From these results, the region responsible for the cross-linking with presecretory proteins was deduced to be located between amino acid residues 267 and 340 from the amino terminus of SecA. These results are discussed in relation to the structure and function of SecA.

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  • SecA, an essential component of the secretory machinery of Escherichia coli, exists as homodimer 査読

    Mitsuru Akita, Akeo Shinkai, Shin-ichi Matsuyama, Shoji Mizushima

    Biochemical and Biophysical Research Communications   174 ( 1 )   211 - 216   1991年1月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Size exclusion chromatography of the cytosolic fraction of SecA-overproducing cells of Escherichia coli suggested that SecA, an essential component of the secretory machinery, exists as an oligomer. The subunit structure of SecA was then studied using a purified specimen. Estimation of the molecular mass by means of ultracentrifugation and chemical cross-linking analysis revealed that SecA exists as a homodimer. The purified SecA was denatured in 6 M guanidine-HCl and renatured to a dimer, which was fully active in terms of translocation, even in the presence of 1 mM dithiothreitol. It is suggested that the dimeric structure is not critically maintained by disulfide bonding between the two subunits, each of which contains four cysteine residues. © 1991.

    DOI: 10.1016/0006-291X(91)90507-4

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  • Quantitative renaturation from a guanidine-denatured state of the SecA dimer, a 200 KDa protein involved in protein secretion in Escherichia coli 査読

    Akeo Shinkai, Mitsuru Akita, Shin-ichi Matsuyama, Shoji Mizushima

    Biochemical and Biophysical Research Communications   172 ( 3 )   1217 - 1223   1990年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    SecA is an essential component of the protein secretory machinery of Escherichia coli. SecA denatured in 6 M guanidine hydrochloride was quantitatively renatured through dilution and dialysis. The renatured SecA was the same as native SecA as to the CD spectrum, fluorescence spectrum for tryptophan residues and dimeric structure. It was as functionally active as native SecA as to interactions with ATP and presecretory proteins, and invitro translocation. SecA-N95, which lacks the carboxyl-terminal 70 amino acid residues including three of four cysteine residues and yet is as active as intact SecA as to in vitro translocation, was also renatured to an active form from the guanidine solution. Furthermore, the renaturation of SecA took place in the presence of 1 mM dithiothreitol. It is concluded that disulfide bridges, both intra- and intermolecular ones, do not play a role in the folding and functioning of the SecA molecule. © 1990.

    DOI: 10.1016/0006-291X(90)91578-G

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  • POTENT AND SPECIFIC-INHIBITION OF MAMMALIAN HISTONE DEACETYLASE BOTH INVIVO AND INVITRO BY TRICHOSTATIN-A 査読

    M YOSHIDA, M KIJIMA, M AKITA, T BEPPU

    JOURNAL OF BIOLOGICAL CHEMISTRY   265 ( 28 )   17174 - 17179   1990年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC  

    (R)-Trichostatin A (TSA) is a Streptomyces product which causes the induction of Friend cell differentiation and specific inhibition of the cell cycle of normal rat fibroblasts in the G1 and G2 phases at the very low concentrations. We found that TSA caused an accumulation of acetylated histone species in a variety of mammalian cell lines. Pulse-labeling experiments indicated that TSA markedly prolonged the in vivo half-life of the labile acetyl groups on histones in mouse mammary gland tumor cells, FM3A. The partially purified histone deacetylase from wild-type FM3A cells was effectively inhibited by TSA in a noncompetitive manner with Ki = 3.4 nM. A newly isolated mutant cell line of FM3A resistant to TSA did not show the accumulation of the acetylated histones in the presence of a higher concentration of TSA. The histone deacetylase preparation from the mutant showed decreased sensitivity to TSA (Ki = 31 nM, noncompetitive). These results clearly indicate that TSA is a potent and specific inhibitor of the histone deacetylase and that the in vivo effect of TSA on cell proliferation and differentiation can be attributed to the inhibition of the enzyme.

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  • SECA INTERACTS WITH SECRETORY PROTEINS BY RECOGNIZING THE POSITIVE CHARGE AT THE AMINO TERMINUS OF THE SIGNAL PEPTIDE IN ESCHERICHIA-COLI 査読

    M AKITA, S SASAKI, S MATSUYAMA, S MIZUSHIMA

    JOURNAL OF BIOLOGICAL CHEMISTRY   265 ( 14 )   8164 - 8169   1990年5月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC  

    SecA is an acidic, peripheral membrane protein involved in the translocation of secretory proteins across the cytoplasmic membrane. The direct interaction of SecA with secretory proteins was demonstrated by means of chemical cross-linking with 1-ethyl-3-(3-dimethylaminoprophyl)carbodiimide. OmpF-Lpp, a model secretory protein, carries either an uncleavable or cleavable signal peptide, and mutant secretory proteins derived from uncleavable OmpF-Lpp were used as translocation substrates. The interaction was SecA-specific. None of the control proteins, which are as acidic as SecA, was cross-linked with uncleavable OmpF-Lpp. The interaction was signal peptide-dependent. The interaction was increasingly enhanced as the number of positively charged amino acid residues at the amino-terminal region of the signal peptide was increased, irrespective of the species of amino acid residues donating the charge. Finally, parallelism was observed between the efficiency of interaction and that of translocation among mutant secretory proteins. It is suggested that precursors of secretory proteins interact with SecA to initiate the translocation reaction.

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  • SecA protein is directly involved in protein secretion inEscherichia coli 査読

    Hisashi Kawasaki, Shin-ichi Matsuyama, Shoichi Sasaki, Mitsuru Akita, Shoji Mizushima

    FEBS Letters   242 ( 2 )   431 - 434   1989年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Wiley  

    DOI: 10.1016/0014-5793(89)80516-2

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書籍等出版物

  • Methods in Enzymology

    Academic Press  2009年 

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  • Methods in Enzymology

    Academic Press  2009年 

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  • 生化学

    日本生化学会  2004年 

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  • 新農業環境工学

    養賢堂  2004年 

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  • 蛋白質核酸酵素5月号別冊 細胞における蛋白質の一生-生成・成熟・輸送・管理・分解・病態

    共立出版  2004年 

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MISC

  • Characterization of chloroplast Hsp70s

    R. M. U. Ratnayake, H. Nonami, M. Akita

    FEBS JOURNAL   274   117 - 117   2007年7月

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:BLACKWELL PUBLISHING  

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  • In vitro chloroplastic protein import experiments with recombinant precursor proteins

    Mitsuru Akita, Hitoshi Inoue, Udayangani Ramayake, M. U, Shuurou Hirano, Hiroki Fujisawa, Aki Nakaji

    PLANT AND CELL PHYSIOLOGY   48   S224 - S224   2007年

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:OXFORD UNIV PRESS  

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  • Site-directed cross-linking interactions between precursor protein and translocons during protein import into chloroplasts

    Hitoshi Inoue, Mitsuru Akita

    PLANT AND CELL PHYSIOLOGY   48   S156 - S156   2007年

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:OXFORD UNIV PRESS  

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  • Tulip flower stalk elongation and sugar metabolisms in relation to the water status

    H. Nonami, N. Sugimoto, H. Wada, M. Akita, R. Erra-Balsells

    COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY   141 ( 3 )   S311 - S311   2005年7月

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:ELSEVIER SCIENCE INC  

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  • 温度処理の違いで変化するチューリップ球根の水溶性炭水化物とイオン種の分析

    杉本直子, 和田博史, 秋田充, ERRA-BALSELLS Rosa, 野並浩

    日本植物生理学会年会要旨集   46th   2005年

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  • Analyses of water-soluble carbohydrates and their cation adducts in tulip bulbs stored under various temperature regimes

    N Sugimoto, H Wada, M Akita, R Erra-Balsells, H Nonami

    PLANT AND CELL PHYSIOLOGY   46   S74 - S74   2005年

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:OXFORD UNIV PRESS  

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  • トレハロースによるチューリップ花弁の水コンダクタンスの低下と細胞膨圧の保持

    和田博史, 杉本直子, 福山寿雄, 井上真理, 秋田充, 野並浩

    日本農業気象学会全国大会日本生物環境調節学会大会合同大会講演要旨   2003   117   2003年9月

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    記述言語:日本語  

    J-GLOBAL

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  • Identification of proteins interacting with ClpC, a HSP100 homologue in chloroplasts

    M Akita, K Keegstra

    MOLECULAR BIOLOGY OF THE CELL   9   103A - 103A   1998年11月

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:AMER SOC CELL BIOLOGY  

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  • Transport of cytoplasmically synthesized proteins into chloroplasts

    K Keegstra, M Akita, J Davila-Aponte, J Froehlich, E Nielsen, S Reumann

    CELLULAR INTEGRATION OF SIGNALLING PATHWAYS IN PLANT DEVELOPMENT   104   23 - 33   1998年

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    記述言語:英語   出版者・発行元:SPRINGER-VERLAG BERLIN  

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  • Identification of protein import machinery in chloroplast via chemical cross-linking.

    M Akita, K Keegstra

    MOLECULAR BIOLOGY OF THE CELL   7   2548 - 2548   1996年12月

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:AMER SOC CELL BIOLOGY  

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  • IDENTIFICATION OF PROTEIN IMPORT MACHINERY IN CHLOROPLAST BY CHEMICAL CROSS-LINKING

    M AKITA, K KEEGSTRA

    JOURNAL OF CELLULAR BIOCHEMISTRY   149 - 149   1995年1月

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    記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:WILEY-LISS  

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共同研究・競争的資金等の研究課題

  • 立体障害を導入した前駆体蛋白質を用いて捕捉した葉緑体蛋白質輸送装置の解析

    2018年4月 - 2021年3月

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    秋田 充

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    配分額:4420000円 ( 直接経費:3400000円 、 間接経費:1020000円 )

    核内ゲノムにコードされた葉緑体蛋白質の前駆体は、独自の包膜蛋白質輸送装置(トランスロコン)を利用して、サイトゾルより輸送される。エネルギー制限下で、前駆体はトランスロコン中で停止した初期膜透過中間体が形成され、本中間体の解析を中心に研究が進んできた。しかし、初期段階以降の輸送が完了するまでの蛋白質輸送機構については未解明である。本研究では、蛋白質輸送途上における蛋白質間相互作用の解析を目的として、前駆体をトランスロコンに目詰まりさせることで蛋白質輸送が途中で停止した後期膜透過中間体を獲得するために、立体障害を導入した前駆体蛋白質の開発を行った。

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  • 葉緑体蛋白質輸送における膜透過中間体の解析

    2013年4月 - 2016年3月

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    秋田 充

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    配分額:5200000円 ( 直接経費:4000000円 、 間接経費:1200000円 )

    核内ゲノムにコードされた葉緑体蛋白質の前駆体は、二重の包膜に存在する独自の蛋白質輸送装置(トランスロコン)を利用して、サイトゾルより輸送される。多くの知見は、包膜透過に必要なエネルギーを制限することで形成される、前駆体輸送がトランスロコン中で停止した初期膜透過中間体の解析により得られてきた。しかし、初期段階における各因子のかかわりや、初期段階以降の前駆体蛋白質、トランスロコン因子の分子機構については未解明である。本研究では、蛋白質輸送における前駆体蛋白質とトランスロコン因子間、またはトランスロコン因子同士間の分子間相互作用を解析するための基盤を整備した。

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  • 高等植物葉緑体への蛋白質輸送における膜透過中間体の解析

    2009年 - 2011年

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    秋田 充

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    配分額:4940000円 ( 直接経費:3800000円 、 間接経費:1140000円 )

    核内ゲノムにコードされた葉緑体蛋白質の前駆体は、二重の包膜に存在する独自の蛋白質輸送装置(トランスロコン)を利用して、サイトゾルより輸送される。輸送過程で包膜透過に必要なエネルギーを制限すると、トランスロコン中で前駆体輸送が停止した初期膜透過中間体を形成する。本研究期間内では、この中間体における前駆体蛋白質とトランスロコン因子間、またはトランスロコン因子同士間の分子間相互作用を時間と空間の二面から解析するための基盤を整備した。

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  • オルガネラアミノ酸トランスポーターの同定とその生理機能解析

    2006年 - 2007年

    日本学術振興会  科学研究費助成事業  特定領域研究

    柿沼 喜己, 秋田 充, 藤木 友紀

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    配分額:5200000円 ( 直接経費:5200000円 )

    1.酵母オルガネラアミノ酸トランスポーターOAAT遺伝子の同定と機能解析
    酵母AVTファミリーとVBAファミリーは液胞膜で機能するOAATである。Avt1〜7とVba1から4のC末端にMycタグを付加してウエスタン解析で検出したところ、その多くが栄養過多と窒素飢餓の間で発現量が大きく変化していた。液胞アミノ酸トランスポーターは栄養環境の変化を感知してその活性を変化させることが示唆された。また、中性アミノ酸を液胞から排出するAvt3とAvt4は、栄養条件による発現量の増減が互いに逆のパターンを示した。これら輸送基質としてのアミノ酸に対する特異性が同一のOAATの間では栄養条件による機能分担があると考えられた。
    2.シロイヌナズナAVT3のアミノ酸輸送活性
    植物培養細胞および酵母で液胞膜局在を報告したAtAVT3サブファミリーについて、GFP融合タンパクの形質転換植物を作出して植物個体レベルで液胞膜局在を確認した。さらにこれらの遺伝子を酵母で発現させ、機能相補を調べた。液胞膜を介したアミノ酸輸送は細胞レベルでのアミノ酸取り込み活性に影響を与えることが報告されている。その結果、AtAVT3aとAtAVT3bがアミノ酸輸送活性を有することがわかった。
    3.AtAroT1の分子機構
    葉緑体局在アミノ酸トランスポーターの候補遺伝子であるAt5g19500遺伝子を大腸菌で過剰発現することにより、アミノ酸輸送活性を測定した。その結果、At5g19500の過剰発現により、チロシンの輸送活性が促進された。さらに、過剰のアミノ酸の存在下で、チロシンの取り込み活性を測定したところ、芳香族アミノ酸(トリプトファン、フェニルアラニン)の取り込み活性が特異的に阻害された。この遺伝子が葉緑体における芳香族アミノ酸トランスポーターであると結論した。

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  • 葉緑体の輸送蛋白質

    2005年

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    資金種別:競争的資金

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  • Transporters in chloroplasts

    2005年

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    資金種別:競争的資金

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  • Gene Expression under Environment Stress in plants

    2003年

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    資金種別:競争的資金

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  • 植物の環境ストレス下における遺伝子発現

    2003年

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  • 高等植物葉緑体ストロマ空間に存在する分子シャペロンHsp93の機能及び構造解析

    2002年

    日本学術振興会  科学研究費助成事業  特定領域研究

    秋田 充

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    配分額:3500000円 ( 直接経費:3500000円 )

    研究代表者は、これまでに高等植物葉緑体ストロマ空間に存在するCタイプHSP100の一つであるHsp93が細胞質で合成された後、葉緑体へ輸送される蛋白質の葉緑体包膜に存在する蛋白質輸送装置の一因子であることを明らかにし、葉緑体においては、Hsp93がミトコンドリアマトリクスに存在するHSP70と同じ役割を果たしているのではないか、と考えている。研究代表者は、Hsp93の葉緑体蛋白質輸送における機能を解析する第一歩として、Hsp93のもつ2つのATP結合ドメインを部位特異的変異法によって改変した変異型リコンビナントHsp93を解析することによって、各々のATP結合ドメインの役割の解明を試みた。これまでのところ、他のHSP100に無い特徴、すなわち、C末端側のATP結合ドメインが、Hsp93が葉緑体内包膜と結合するために重要であることが判明した。現在、変異型Hsp93の個々のATP結合ドメインの機能をATP分解活性、多量体形成等の生化学的な見地から研究を進めている。N末端にヒスチジンタグを持つHsp93を大腸菌でリコンビナント蛋白質の生産には成功し、精製を試みたが、かなりの量の夾雑蛋白質が観察され、更にATP分解活性が極めて低い蛋白質しか得られなかった。これは、リコンビナント蛋白質が、正しい構造をとっていないことに起因すると考えられ、現在、無細胞蛋白質合成系によって、Hsp93の取得を試みている.一方、Hsp93の機能解析の上で重要なHsp93と相互作用する葉緑体蛋白質を検索しており、抗Hsp93抗体を用いたイムノアフィニティーカラムを用いることにより、いくつかの蛋白質が検出されている。そこで、現在それらの蛋白質の同定もあわせて試みている。

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  • 高等植物における分子シャペロンの機能解析

    1997年

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    資金種別:競争的資金

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  • Protein Targeting to Chloroplasts

    1997年

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    資金種別:競争的資金

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  • タンパク質の葉緑体への移行

    1997年

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    資金種別:競争的資金

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  • Function of Moleculan Chaparones in Higher Plants

    1997年

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    資金種別:競争的資金

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