Document Detail

The light sensitivity of ATP synthase mutants of Chlamydomonas reinhardtii.
MedLine Citation:
PMID:  11351104     Owner:  NLM     Status:  MEDLINE    
Chlamydomonas reinhardtii mutants defective in the chloroplast ATP synthase are highly sensitive to light. The ac46 mutant is affected in the MDH1 gene, required for production or stability of the monocistronic atpH mRNA encoding CF(O)-III. In this and other ATP synthase mutants, we show that short-term exposure to moderate light intensities-a few minutes-induces an inhibition of electron transfer after the primary quinone acceptor of photosystem II (PSII), whereas longer exposure-several hours-leads to a progressive loss of PSII cores. An extensive swelling of thylakoids accompanies the initial inhibition of electron flow. Thylakoids deflate as PSII cores are lost. The slow process of PSII degradation involves the participation of ClpP, a chloroplast-encoded peptidase that is part of a major stromal protease Clp. In the light of the above findings, we discuss the photosensitivity of ATP synthase mutants with respect to the regular photoinhibition process that affects photosynthetic competent strains at much higher light intensities.
W Majeran; J Olive; D Drapier; O Vallon; F A Wollman
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Plant physiology     Volume:  126     ISSN:  0032-0889     ISO Abbreviation:  Plant Physiol.     Publication Date:  2001 May 
Date Detail:
Created Date:  2001-05-14     Completed Date:  2001-07-26     Revised Date:  2013-06-11    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  421-33     Citation Subset:  IM    
Unité Propre de Recherche-Centre National de la Recherche Scientifique 1261, Institut de Biologie Physico-Chimique, 13 rue Pierre et Marie Curie, 75005 Paris, France.
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MeSH Terms
Adenosine Triphosphatases / metabolism
Base Sequence
Chlamydomonas reinhardtii / enzymology,  radiation effects*,  ultrastructure
DNA Primers
Endopeptidase Clp
Freeze Fracturing
Microscopy, Electron
Photosynthetic Reaction Center Complex Proteins / metabolism
Photosystem II Protein Complex
Proton-Translocating ATPases / genetics,  metabolism*
RNA, Messenger / genetics
Serine Endopeptidases / metabolism
Thylakoids / radiation effects
Reg. No./Substance:
0/DNA Primers; 0/Photosynthetic Reaction Center Complex Proteins; 0/Photosystem II Protein Complex; 0/RNA, Messenger; EC 3.4.21.-/Serine Endopeptidases; EC Clp; EC 3.6.1.-/Adenosine Triphosphatases; EC ATPases

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