Document Detail

Blue and red light reversibly control psbA expression in the cyanobacterium Synechococcus sp. strain PCC 7942.
MedLine Citation:
PMID:  8206914     Owner:  NLM     Status:  MEDLINE    
The three psbA genes encoding the photosystem II D1 protein in Synechococcus sp. strain PCC 7942 respond differentially to an increase in intensity of white light through transcriptional induction of psbAII and psbAIII and accelerated degradation of psbAI and psbAIII messages. We report that the genes exhibit a novel photoreversible response involving blue and red light that is almost indistinguishable from the high-white light response. Transfer of cells from white to low-fluence blue light caused a decrease in the level of the psbAI message and increased levels of psbAII and psbAIII messages, whereas transfer to red or far-red light had little effect. Five min of blue light was sufficient to trigger psbAII and psbAIII induction; five min of subsequent red irradiation attenuated this response, whereas subsequent green or far-red light (or darkness) had no effect. Response to both high and blue light was insensitive to inhibitors of photosynthetic electron transport. We propose that Synechococcus modulates photosystem II biosynthesis in a variable light environment through a photoreception signal pathway, which is independent of photosystem II activity and which is distinct from red/green-reversible control of chromatically adapting cyanobacteria and the red/far-red-reversible phytochrome of plants.
N F Tsinoremas; M R Schaefer; S S Golden
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The Journal of biological chemistry     Volume:  269     ISSN:  0021-9258     ISO Abbreviation:  J. Biol. Chem.     Publication Date:  1994 Jun 
Date Detail:
Created Date:  1994-07-13     Completed Date:  1994-07-13     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  2985121R     Medline TA:  J Biol Chem     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  16143-7     Citation Subset:  IM    
Department of Biology, Texas A & M University, College Station 77843-3258.
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MeSH Terms
Bacterial Proteins / biosynthesis*,  genetics
Cyanobacteria / genetics,  radiation effects*
Gene Expression Regulation / radiation effects*
Genes, Bacterial / radiation effects*
Multigene Family / radiation effects
Photosystem II Protein Complex
Plant Proteins / biosynthesis*,  genetics
RNA, Messenger / analysis
Signal Transduction*
Transcription, Genetic
Grant Support
Reg. No./Substance:
0/Bacterial Proteins; 0/Photosystem II Protein Complex; 0/Plant Proteins; 0/RNA, Messenger

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