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Plant and Cell Physiology Advance Access originally published online on July 15, 2009
Plant and Cell Physiology 2009 50(9):1721-1725; doi:10.1093/pcp/pcp105
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© The Author 2009. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Short Communication

The Arabidopsis 26S Proteasome Subunit RPN1a is Required for Optimal Plant Growth and Stress Responses

Songhu Wang, Jasmina Kurepa and Jan A. Smalle*

Plant Physiology, Biochemistry, Molecular Biology Program, Department of Plant and Soil Sciences, College of Agriculture, University of Kentucky, Lexington, KY 40546, USA

*Corresponding author: E-mail, jsmalle{at}uky.edu; Fax, +1-859–323-1077.


  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.

Keywords: Arabidopsis thaliana - Cell size - Proteasome - Regulatory particle non-ATPase - Stress resistance

Abbreviations: 20SP, 20S proteasome; 26SP, 26S proteasome; RP, regulatory particle; RPN, RP non-ATPase subunit; RPT, RP AAA ATPase subunit; RT–PCR, reverse transcription–PCR.

(Received April 21, 2009; Accepted July 12, 2009)
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