Arabidopsis thaliana 26S Proteasome Subunits RPT2a and RPT5a Are Crucial for Zinc Deficiency-Tolerance

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概要

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• RPTs (regulatory particle triple-A-ATPase) are components of 26S proteasome. We found novel roles of RPT2a and RPT5a in Zn deficiency-tolerance. Arabidopsis thaliana mutants carrying T-DNA in RPT2a and RPT5a were more sensitive to Zn deficiency than the wild-type. In the rpt mutants, the shoot Zn contents were similar to those of the wild-type. Transcripts of Zn deficiency-inducible genes were highly accumulated in the rpt mutants, suggesting that the rpt mutants suffer from various Zn deficiency symptoms, although the Zn levels are not reduced. Lipid peroxidation levels, known to be increased under Zn deficiency, were higher in the rpt mutants than in the wild-type. Poly-ubiquitinated proteins were accumulated upon exposure to Zn deficiency, especially in the rpt mutants. Overall, this study indicates that RPT2a and RPT5a are involved in Zn deficiency-tolerance, possibly through alleviation of oxidative stresses and/or processing of poly-ubiquitinated proteins.

• 社団法人 日本農芸化学会の論文

著者

• Sakamoto Takuya

  Department Of Communications And Computer Engineering Graduate School Of Informatics Kyoto Universit

• SAKO Kaori

  Faculty of Advanced Life Science and Graduate School of Life Science, Hokkaido University

• YAMAGUCHI Junji

  Faculty of Advanced Life Science and Graduate School of Life Science, Hokkaido University

• FUJIWARA Toru

  Biotechnology Research Center, The University of Tokyo

• Yamagami Mutsumi

  Institute of Environmental Science and Technology

• KAMIYA Takehiro

  Biotechnology Research Center, The University of Tokyo

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