Identification of clp Genes Expressed in Senescing Arabidopsis Leaves
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概要
- 論文の詳細を見る
Clp protease is a highly selective protease in E.coli, which consists of two types of subunits, the regulatory subunit with ATPase activity, ClpA, and the catalytic subunit, ClpP. In order to examine the possible association of plant Clp protease with the degradation of protein in senescing chloroplasts, we isolated a cDNA clone for ClpC which is a plant homologue of ClpA from Arabidopsis thaliana in addition to ERD1 which we had isolated earlier [Kiyosue et al.(1993)Biochem.Biophys.Res.Commun.196: 1214]. We also isolated a clone for the plastidic gene, clpP(pclpP)and cDNA clones for putative nuclear clpP genes(nclpP1-6). We analyzed the expression of these clp genes in Arabidopsis leaves after various dark periods and during natural senescence. The expression of erd1 was increased by dark-induced and by natural senescence, as reported earlier [Nakashima et al.(1997)Plant J.12: 851], while that of AtclpC was decreased. Two catalytic subunits nclpPs(nclpP3 and nclpP5)showed high expression in naturally senescing leaves, but the expression of pclpP and the other nclpPs was not changed. Immunoblot analysis of chloroplast protein and in vitro import analysis demonstrated that both nucles-encoded regulatory subunits as well as nClpP5 were localized in the chloroplast stroma. These observations suggest that chloroplast Clp protease is composed of very complicated combinations of subunits, and that ERD1, nClpP5 and pClpP have a role in the concerted degradation of protein in senescing chloroplasts.
- 日本植物生理学会の論文
著者
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ITO Masaki
Department of Neurosurgery, Asahikawa Red Cross Hospital
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Watanabe Akira
Department of Biological Sciences, Graduate School of Science, University of Tokyo
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SHINOZAKI Kazuo
Laboratory of Plant Molecular Biology, RIKEN Tsukuba Institute
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Ito M
Dept. Biol. Sci. Grad. Sch. Sci. Univ. Tokyo
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NAKABAYASHI Kazumi
Department of Biological Sciences, Graduate School of Science, UT
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Shinozaki K
Tokyo Inst. Technol. Tokyo Jpn
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Shinozaki Kazuo
Laboratory Of Plant Molecular Biology The Insitute Of Physical And Chemical Research(riken)
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Kiyosue Tomohiro
Laboratory of Plant Molecular Biology, The Institute of Physical and Chemical Research(RIKEN)
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Shinozaki K
Laboratory Of Plant Molecular Biology The Insitute Of Physical And Chemical Research(riken)
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Nakabayashi Kazumi
Dept. Biol. Sci. Grad. Sch. Sci. Univ. Tokyo
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Nakabayashi Kazumi
Department Of Biological Sciences Graduate School Of Science Ut
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Watanabe A
Dept. Biol. Sci. Grad. Sch. Sci. Univ. Tokyo
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Shinozaki Kazuo
Laboratory Of Plant Molecular Biology Riken
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Ito Masaki
Department Of Anesthesiology Saitama Circulation And Respiratory Center
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Kiyosue Tomohiro
Laboratory Of Plant Molecular Biology The Institute Of Physical And Chemical Research(riken):(presen
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Kiyosue Tomohiro
Laboratory Of Plant Molecular Biology The Institute Of Physical And Chemical Research (riken)
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Watanabe Akira
Department Of Biological Sciences Graduate School Of Science The University Of Tokyo
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Ito Masaki
Department Of Anesthesiology Nagano Matsushiro General Hospital
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Watanabe Akira
Department Of Applied Biological Chemistry Faculty Of Agriculture Tohoku University
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