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Plant and Cell Physiology Advance Access published online on April 11, 2006
Plant and Cell Physiology, doi:10.1093/pcp/pcj047
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Plant and Cell Physiology 2006 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received February 21, 2006
Accepted April 4, 2006

Short Communication

The Role of a Zinc Finger-Containing Glycine-Rich RNA-Binding Protein During Cold Adaptation Process in Arabidopsis thaliana

Yeon-Ok Kim 1 and Hunseung Kang 1 *

1 Department of Plant Biotechnology and Agricultural Plant Stress Research Center, College of Agriculture and Life Sciences, Chonnam National University, Gwangju, 500-757 Korea

* To whom correspondence should be addressed.
Hunseung Kang, E-mail: hskang{at}chonnam.ac.kr


  Abstract

The mechanistic role of a glycine-rich RNA-binding protein designated atRZ-1a that contributes to enhance cold tolerance in Arabidopsis was investigated. Overexpression of atRZ-1a did not affect the expression of various cold-responsive genes such as COR6.6, COR15a, COR47, RD29A, RD29B and LTI29. Proteome analyses revealed that overexpression of atRZ-1a modulated the expression of several stress-responsive genes, and the transcript levels and RNA stability of these target genes were not affected by atRZ-1a. atRZ-1a successfully complements the cold sensitivity of E. coli lacking four cold shock proteins. These results strongly suggest that atRZ-1a plays a role as an RNA chaperone during cold adaptation process.

Keywords: Arabidopsis; Cold adaptation; Cold shock protein; Glycine-rich RNA-binding protein; RNA chaperone.
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