The Arabidopsis 26S proteasome subunit RPN1a is required for optimal plant growth and stress responses.

Songhu Wang, Jasmina Kurepa, Jan A. Smalle

Research output: Contribution to journalArticlepeer-review

56 Scopus citations

Abstract

The current literature offers contradictory results regarding the role of the proteasome subunit RPN1a in Arabidopsis development. Here we show that plants lacking RPN1a are viable and have increased cell sizes, decreased heat shock tolerance, increased oxidative stress tolerance and other phenotypes characteristic for 26S proteasome subunit mutants. These results strengthen our contention that most of the phenotypes of 26S proteasome mutants in Arabidopsis described to date reflect a general impairment in 26S proteasome function rather than a specific defect of a single subunit, and suggest that the role of the RPN1a subunit during embryogenesis needs to be reconsidered.

Original languageEnglish
Pages (from-to)1721-1725
Number of pages5
JournalPlant and Cell Physiology
Volume50
Issue number9
DOIs
StatePublished - 2009

Bibliographical note

Funding Information:
The Kentucky Tobacco Research and Development Center; the USDA Cooperative State Research, Education and Extension Service (grant No. 2005-35304-16043); the Kentucky Science and Engineering Foundation (grant No. 148-502-06-189).

ASJC Scopus subject areas

  • Physiology
  • Plant Science
  • Cell Biology

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