Document Detail

Bacteriophytochrome controls photosystem synthesis in anoxygenic bacteria.
MedLine Citation:
PMID:  12000965     Owner:  NLM     Status:  MEDLINE    
Plants use a set of light sensors to control their growth and development in response to changes in ambient light. In particular, phytochromes exert their regulatory activity by switching between a biologically inactive red-light-absorbing form (Pr) and an active far-red-light absorbing form (Pfr). Recently, biochemical and genetic studies have demonstrated the occurrence of phytochrome-like proteins in photosynthetic and non-photosynthetic bacteria--but little is known about their functions. Here we report the discovery of a bacteriophytochrome located downstream from the photosynthesis gene cluster in a Bradyrhizobium strain symbiont of Aeschynomene. The synthesis of the complete photosynthetic apparatus is totally under the control of this bacteriophytochrome. A similar behaviour is observed for the closely related species Rhodopseudomonas palustris, but not for the more distant anoxygenic photosynthetic bacteria of the genus Rhodobacter, Rubrivivax or Rhodospirillum. Unlike other (bacterio)phytochromes, the carboxy-terminal domain of this bacteriophytochrome contains no histidine kinase features. This suggests a light signalling pathway involving direct protein-protein interaction with no phosphorelay cascade. This specific mechanism of regulation may represent an important ecological adaptation to optimize the plant-bacteria interaction.
Eric Giraud; Joël Fardoux; Nicolas Fourrier; Laure Hannibal; Bernard Genty; Pierre Bouyer; Bernard Dreyfus; André Verméglio
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Nature     Volume:  417     ISSN:  0028-0836     ISO Abbreviation:  Nature     Publication Date:  2002 May 
Date Detail:
Created Date:  2002-05-09     Completed Date:  2002-05-23     Revised Date:  2005-11-17    
Medline Journal Info:
Nlm Unique ID:  0410462     Medline TA:  Nature     Country:  England    
Other Details:
Languages:  eng     Pagination:  202-5     Citation Subset:  IM    
LSTM TA 10/J Laboratoire des Symbioses Tropicales et Méditerranéennes, UMR 113, IRD/CIRAD/INRA/ENSA-M. Campus de Baillarguet, 34398 Montpellier Cedex 5, France.
Data Bank Information
Bank Name/Acc. No.:
GENBANK/AF064527;  AF182374;  X17342
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MeSH Terms
Absorption / radiation effects
Amino Acid Sequence
Bacterial Proteins / chemistry,  genetics,  metabolism*
Bradyrhizobium / genetics,  metabolism*,  radiation effects
Genes, Bacterial / genetics
Molecular Sequence Data
Multigene Family / genetics
Mutation / genetics
Open Reading Frames / genetics
Oxygen / metabolism
Photosynthesis* / genetics,  radiation effects
Photosynthetic Reaction Center Complex Proteins* / radiation effects
Pigments, Biological / chemistry,  genetics,  metabolism*
Reg. No./Substance:
0/Bacterial Proteins; 0/Photosynthetic Reaction Center Complex Proteins; 0/Pigments, Biological; 7782-44-7/Oxygen

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