Journal
FEBS LETTERS
Volume 581, Issue 23, Pages 4371-4376Publisher
WILEY-BLACKWELL
DOI: 10.1016/j.febslet.2007.07.081
Keywords
glutaredoxin; chloroplast; methionine; methionine sulfoxide reductase; plant; thioredoxin
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Methionine suffoxide reductases (MSRs) A and B reduce methionine sulfoxide (MetSO) S- and R-diastereomers, respectively, back to Met using electrons generally supplied by thioredoxin. The physiological reductants for MSRBs remain unknown in plants, which display a remarkable variety of thioredoxins (Trxs) and glutaredoxins (Grxs). Using recombinant proteins, we show that Arabidopsis plastidial MSRB1 and MSRB2, which differ regarding the number of presumed redox-active cysteines, possess specific reductants. Most simple-module Trxs, especially Trx m1 and Trx y2, are preferential and efficient electron donors towards MSRB2, while the doublemodule CDSP32 Trx and Grxs can reduce only MSRB1. This study identifies novel types of reductants, related to Grxs and peculiar Trxs, for MSRB proteins displaying only one redoxactive cysteine. (c) 2007 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
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