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Exploring the active site of plant glutaredoxin by site-directed mutagenesis

Six mutants (Y26A, C27S, Y29F, Y29P, C30S and Y26W/Y29P) have been engineered in order to explore the active site of poplar glutaredoxin (Grx) (Y 26CPYC 30). The cysteinic mutants indicate that Cys 27 is the primary nucleophile. Phe is a good substitute for Tyr 29, but the Y29P mutant was inactive....

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Bibliographic Details
Published in:FEBS letters 2002-01, Vol.511 (1), p.145-149
Main Authors: Rouhier, Nicolas, Gelhaye, Eric, Jacquot, Jean-Pierre
Format: Article
Language:English
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Summary:Six mutants (Y26A, C27S, Y29F, Y29P, C30S and Y26W/Y29P) have been engineered in order to explore the active site of poplar glutaredoxin (Grx) (Y 26CPYC 30). The cysteinic mutants indicate that Cys 27 is the primary nucleophile. Phe is a good substitute for Tyr 29, but the Y29P mutant was inactive. The Y26A mutation caused a moderate loss of activity. The YCPPC and WCPPC mutations did not improve the reactivity of Grx with the chloroplastic NADP-malate dehydrogenase, a well known target of thioredoxins (Trxs). The results are discussed in relation with the known biochemical properties of Grx and Trx.
ISSN:0014-5793
1873-3468
DOI:10.1016/S0014-5793(01)03302-6