Document Detail

Involvement of thioredoxin y2 in the preservation of leaf methionine sulfoxide reductase capacity and growth under high light.
MedLine Citation:
PMID:  22943306     Owner:  NLM     Status:  Publisher    
Methionine in proteins can be oxidized to two diastereoisomers of methionine sulfoxide, Met-S-O and Met-R-O, which are reduced back to Met by two types of methionine sulfoxide reductases (MSRs), A and B, respectively. MSRs are generally supplied with reducing power by thioredoxins. Plants are characterized by a large number of thioredoxin isoforms, but those providing electrons to MSRs in vivo are not known. Three MSR isoforms, MSRA4, MSRB1 and MSRB2 are present in Arabidopsis thaliana chloroplasts. Under conditions of high light and long photoperiod, plants knockdown for each plastidial MSR type or for both display reduced growth. In contrast, over-expression of plastidial MSRBs is not associated with beneficial effects in terms of growth under high light. To identify the physiological reductants for plastidial MSRs, we analyzed a series of mutants deficient for thioredoxins f, m, x or y. We show that mutant lines lacking both thioredoxins y1 and y2 or only thioredoxin y2 specifically display a significantly reduced leaf MSR capacity (- 25%) and growth characteristics under high light related to those of plants lacking plastidial MSRs. We propose that thioredoxin y2 plays a physiological function in protein repair mechanisms as an electron donor to plastidial MSRs in photosynthetic organs. © 2012 Blackwell Publishing Ltd.
Edith Laugier; Lionel Tarrago; Agathe Courteille; Gilles Innocenti; Françoise Eymery; Dominique Rumeau; Emmanuelle Issakidis-Bourguet; Pascal Rey
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-9-3
Journal Detail:
Title:  Plant, cell & environment     Volume:  -     ISSN:  1365-3040     ISO Abbreviation:  Plant Cell Environ.     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-9-4     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9309004     Medline TA:  Plant Cell Environ     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2012 Blackwell Publishing Ltd.
CEA, DSV, IBEB, Lab Ecophysiol Molecul Plantes, Saint-Paul-lez-Durance, F-13108, France CNRS, UMR 7265 Biol Veget & Microbiol Environ, Saint-Paul-lez-Durance, F-13108, France Aix-Marseille Université, Saint-Paul-lez-Durance, F-13108, France  IBP, UMR CNRS 8618, Univ Paris-Sud, 91405, Orsay cedex, France 
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