4.8 Article

The RPN5 Subunit of the 26s Proteasome Is Essential for Gametogenesis, Sporophyte Development, and Complex Assembly in Arabidopsis

Journal

PLANT CELL
Volume 21, Issue 2, Pages 460-478

Publisher

AMER SOC PLANT BIOLOGISTS
DOI: 10.1105/tpc.108.064444

Keywords

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Funding

  1. U. S. Department of Energy Basic Energy Sciences program [DE-FG02-88ER13968]
  2. National Science Foundation Arabidopsis 2010 Program [MCB-0115870]
  3. National Institutes of Health predoctoral fellowship [5F31NS054563]
  4. Louis and Elisa Thomsen Wisconsin Distinguished Predoctoral Fellowship
  5. Wain International Travel Fellowship
  6. Oberlin and Franklin and Marshall Colleges
  7. U.S. Department of Energy (DOE) [DE-FG02-88ER13968] Funding Source: U.S. Department of Energy (DOE)

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The 26S proteasome is an essential multicatalytic protease complex that degrades a wide range of intracellular proteins, especially those modified with ubiquitin. Arabidopsis thaliana and other plants use pairs of genes to encode most of the core subunits, with both of the isoforms often incorporated into the mature complex. Here, we show that the gene pair encoding the regulatory particle non-ATPase subunit (RPN5) has a unique role in proteasome function and Arabidopsis development. Homozygous rpn5a rpn5b mutants could not be generated due to a defect in male gametogenesis. While single rpn5b mutants appear wild-type, single rpn5a mutants display a host of morphogenic defects, including abnormal embryogenesis, partially deetiolated development in the dark, a severely dwarfed phenotype when grown in the light, and infertility. Proteasome complexes missing RPN5a are less stable in vitro, suggesting that some of the rpn5a defects are caused by altered complex integrity. The rpn5a phenotype could be rescued by expression of either RPN5a or RPN5b, indicating functional redundancy. However, abnormal phenotypes generated by overexpression implied that paralog-specific functions also exist. Collectively, the data point to a specific role for RPN5 in the plant 26S proteasome and suggest that its two paralogous genes in Arabidopsis have both redundant and unique roles in development.

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