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

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  • SAKAMOTO Takuya
    Department of Biotechnology, Graduate School of Agricultural and Life Sciences, The University of Tokyo Biotechnology Research Center, The University of Tokyo
  • KAMIYA Takehiro
    Biotechnology Research Center, The University of Tokyo
  • 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
  • YAMAGAMI Mutsumi
    Institute of Environmental Sciences
  • FUJIWARA Toru
    Biotechnology Research Center, The University of Tokyo Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo Core Research for Evolutional Science and Technology, Japan Science and Technology Agency

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

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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.

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