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Plant and Cell Physiology Advance Access published online on February 23, 2006
Plant and Cell Physiology, doi:10.1093/pcp/pcj023
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Plant and Cell Physiology 2006 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received November 21, 2005
Accepted February 15, 2006

Regular Paper

The Chloroplast Protein Disulfide Isomerase RB60 Reacts with a Regulatory Disulfide of the RNA-Binding Protein RB47

Tal Alergand 1, Hadas Peled-Zehavi 1, Yael Katz 1, and Avihai Danon 1 *

1 The Department of Plant Sciences, Weizmann Institute of Science, Rehovot 76100, ISRAEL

* To whom correspondence should be addressed.
Avihai Danon, E-mail: avihai.danon{at}weizmann.ac.il


  Abstract

Biochemical studies have identified two proteins, RB47 and RB60, that are involved in the light-regulated translation of the psbA mRNA in the chloroplast of the unicellular alga Chlamydomonas reinhardtii. RB47, a member of the eukaryotic poly(A)-binding protein family, binds directly to the 5' untranslated region (UTR) of the mRNA, whereas, RB60, a protein disulfide isomerase (PDI), is thought to bind to RB47 and to modulate its activity via redox and phosphorylation events. Our present studies show that RB47 forms a single disulfide bridge that most likely involves Cys143 and Cys259. We found that RB60 reacts with high selectivity with the disulfide of RB47, suggesting that the redox states of these two redox-partners are coupled. Kinetics analysis indicated that RB47 contains two fast reacting cysteines, of which at least one is sensitive to changes in pH conditions. The results support the notion that light controls the redox regulation of RB47 function via the coupling of RB47 and RB60 redox states, and suggest that light-induced changes in stromal pH might contribute to the regulation.

Keywords: Chloroplast; pH; Protein disulfide isomerase; Redox-regulation; Regulatory disulfide; RNA-binding protein.
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