Document Detail


Mobilization of photosystem II induced by intense red light in the Cyanobacterium Synechococcus sp PCC7942.
MedLine Citation:
PMID:  16387835     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We use confocal fluorescence microscopy and fluorescence recovery after photobleaching to show that a specific light signal controls the diffusion of a protein complex in thylakoid membranes of the cyanobacterium Synechococcus sp PCC7942 in vivo. In low light, photosystem II appears completely immobile in the membrane. However, exposure to intense red light triggers rapid diffusion of up to approximately 50% of photosystem II reaction centers. Particularly intense or prolonged red light exposure also leads to the redistribution of photosystem II to specific zones within the thylakoid membranes. The mobilization does not result from photodamage but is triggered by a specific red light signal. We show that mobilization of photosystem II is required for the rapid initiation of recovery from photoinhibition. Thus, intense red light triggers a switch from a static to a dynamic configuration of thylakoid membrane protein complexes, and this facilitates the rapid turnover and repair of the complexes. The localized concentrations of photosystem II seen after red light treatment may correspond to specific zones where the repair cycle is active.
Authors:
Mary Sarcina; Nikolaos Bouzovitis; Conrad W Mullineaux
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-12-30
Journal Detail:
Title:  The Plant cell     Volume:  18     ISSN:  1040-4651     ISO Abbreviation:  Plant Cell     Publication Date:  2006 Feb 
Date Detail:
Created Date:  2006-02-02     Completed Date:  2006-08-04     Revised Date:  2013-06-07    
Medline Journal Info:
Nlm Unique ID:  9208688     Medline TA:  Plant Cell     Country:  United States    
Other Details:
Languages:  eng     Pagination:  457-64     Citation Subset:  IM    
Affiliation:
School of Biological Sciences, Queen Mary, University of London, London E1 4NS, United Kingdom.
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MeSH Terms
Descriptor/Qualifier:
Chlorophyll / metabolism,  radiation effects
Color
Diffusion
Fluorescence Recovery After Photobleaching
Light*
Oxygen / metabolism
Photosystem II Protein Complex / metabolism*
Spectrometry, Fluorescence
Synechococcus / classification,  metabolism*,  radiation effects*
Temperature
Grant Support
ID/Acronym/Agency:
//Wellcome Trust
Chemical
Reg. No./Substance:
0/Photosystem II Protein Complex; 1406-65-1/Chlorophyll; 7782-44-7/Oxygen
Comments/Corrections

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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