Linked Life Data

20487293

Source:http://linkedlifedata.com/resource/pubmed/id/20487293

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2010-5-21
pubmed:abstractText
Purple non-sulphur phototrophic bacteria (PNSB) are excellent models for analysing the co-ordination of major metabolisms, including oxidative phosphorylation, photophosphorylation, carbon dioxide fixation and nitrogen fixation. In species studied to date, a two-component system called RegBA controls these functions and it has been thought that this redox sensing regulatory system is essential for co-ordinating electron flow and cannot be easily replaced. Here we show that this is not the case for all PNSB and that the oxygen-sensing FixLJ-K system, initially described in rhizobia, controls microaerobic respiration, photophosphorylation and other major metabolic traits in Rhodopseudomonas palustris. A R. palustris fixK mutant grew normally aerobically but was impaired in microaerobic growth. It was also severely impaired in photosynthetic growth. Transcriptome analyses indicated that FixK positively regulates haem and bacteriochlorophyll biosynthesis, cbb3 oxidase and NADH dehydrogenase genes, as well as genes for autotrophy and aromatic compound degradation. Purified FixK interacted with the promoters of a bacteriochlorophyll biosynthesis operon, a bacteriophytochrome-histidine kinase gene and the fnr-type regulatory gene, aadR. A FixK-AadR hierarchy mediates the transition from microaerobic to anaerobic growth. These results underscore that physiologically similar bacteria can use very different regulatory strategies to control common major metabolisms.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
1365-2958
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
75
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1007-20
pubmed:meshHeading
pubmed:year
2010
pubmed:articleTitle
FixK, a global regulator of microaerobic growth, controls photosynthesis in Rhodopseudomonas palustris.
pubmed:affiliation
Department of Microbiology, The University of Washington, Seattle, WA 98115, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S.