Document Detail

Bathy phytochromes in rhizobial soil bacteria.
MedLine Citation:
PMID:  20675484     Owner:  NLM     Status:  MEDLINE    
Phytochromes are biliprotein photoreceptors that are found in plants, bacteria, and fungi. Prototypical phytochromes have a Pr ground state that absorbs in the red spectral range and is converted by light into the Pfr form, which absorbs longer-wavelength, far-red light. Recently, some bacterial phytochromes have been described that undergo dark conversion of Pr to Pfr and thus have a Pfr ground state. We show here that such so-called bathy phytochromes are widely distributed among bacteria that belong to the order Rhizobiales. We measured in vivo spectral properties and the direction of dark conversion for species which have either one or two phytochrome genes. Agrobacterium tumefaciens C58 contains one bathy phytochrome and a second phytochrome which undergoes dark conversion of Pfr to Pr in vivo. The related species Agrobacterium vitis S4 contains also one bathy phytochrome and another phytochrome with novel spectral properties. Rhizobium leguminosarum 3841, Rhizobium etli CIAT652, and Azorhizobium caulinodans ORS571 contain a single phytochrome of the bathy type, whereas Xanthobacter autotrophicus Py2 contains a single phytochrome with dark conversion of Pfr to Pr. We propose that bathy phytochromes are adaptations to the light regime in the soil. Most bacterial phytochromes are light-regulated histidine kinases, some of which have a C-terminal response regulator subunit on the same protein. According to our phylogenetic studies, the group of phytochromes with this domain arrangement has evolved from a bathy phytochrome progenitor.
Gregor Rottwinkel; Inga Oberpichler; Tilman Lamparter
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-07-30
Journal Detail:
Title:  Journal of bacteriology     Volume:  192     ISSN:  1098-5530     ISO Abbreviation:  J. Bacteriol.     Publication Date:  2010 Oct 
Date Detail:
Created Date:  2010-09-17     Completed Date:  2010-10-05     Revised Date:  2013-05-29    
Medline Journal Info:
Nlm Unique ID:  2985120R     Medline TA:  J Bacteriol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  5124-33     Citation Subset:  IM    
Institute of Botany, Faculty of Chemistry and Biosciences, Karlsruhe Institute of Technology, Kaiserstr. 2, 76131 Karlsruhe, Germany.
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MeSH Terms
Agrobacterium tumefaciens / genetics,  metabolism
Azorhizobium caulinodans / genetics,  metabolism
Bacterial Proteins / genetics,  metabolism*
Computational Biology
Phytochrome / classification,  genetics,  metabolism*
Rhizobium / genetics,  metabolism*
Rhizobium etli / genetics,  metabolism
Rhizobium leguminosarum / genetics,  metabolism
Xanthobacter / genetics,  metabolism
Reg. No./Substance:
0/Bacterial Proteins; 11121-56-5/Phytochrome

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