Document Detail

Phototropin blue-light receptors.
MedLine Citation:
PMID:  17067285     Owner:  NLM     Status:  MEDLINE    
Phototropins are blue-light receptors controlling a range of responses that serve to optimize the photosynthetic efficiency of plants. These include phototropism, light-induced stomatal opening, and chloroplast movements in response to changes in light intensity. Since the isolation of the Arabidopsis PHOT1 gene in 1997, phototropins have been identified in ferns and mosses where their physiological functions appear to be conserved. Arabidopsis contains two phototropins, phot1 and phot2, that exhibit overlapping functions in addition to having unique physiological roles. Phototropins are light-activated serine/threonine protein kinases. Light sensing by the phototropins is mediated by a repeated motif at the N-terminal region of the protein known as the LOV domain. Photoexcitation of the LOV domain results in receptor autophosphorylation and an initiation of phototropin signaling. Here we summarize the photochemical and biochemical events underlying phototropin activation in addition to the current knowledge of the molecular mechanisms associated with photoreceptor signaling.
John M Christie
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Review    
Journal Detail:
Title:  Annual review of plant biology     Volume:  58     ISSN:  1543-5008     ISO Abbreviation:  Annu Rev Plant Biol     Publication Date:  2007  
Date Detail:
Created Date:  2007-05-02     Completed Date:  2007-07-31     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  101140127     Medline TA:  Annu Rev Plant Biol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  21-45     Citation Subset:  IM    
Plant Science Group, Division of Biochemistry and Molecular Biology, Institute of Biomedical and Life Sciences, University of Glasgow, Glasgow, Scotland, United Kingdom.
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MeSH Terms
Calcium / metabolism
Chloroplasts / metabolism
Hypocotyl / growth & development,  metabolism,  radiation effects
Models, Molecular
Photosynthetic Reaction Center Complex Proteins / chemistry,  physiology*
Plant Proteins / chemistry,  physiology*
Plants / growth & development,  metabolism*,  radiation effects
Protein Structure, Tertiary / physiology
Protein-Serine-Threonine Kinases / chemistry,  physiology*
Signal Transduction
Reg. No./Substance:
0/Photosynthetic Reaction Center Complex Proteins; 0/Plant Proteins; 7440-70-2/Calcium; EC Kinases

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

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