RMeseeartcah Abrtoiclelic Flexibility Revealed in the Genome of the Cyst-forming α-1 Proteobacterium Rhodospirillum Centenum
Year: 2010
Type: article
Abstract: Background: Rhodospirillum centenum is a photosynthetic non-sulfur purple bacterium that favors growth in an \nanoxygenic, photosynthetic N2-fixing environment. It is emerging as a genetically amenable model organism for \nmolecular genetic analysis of cyst formation, photosynthesis, phototaxis, and cellular development. Here, we present \nan analysis of the genome of this bacterium. \nResults: R. centenum contains a singular circular chromosome of 4,355,548 base pairs in size harboring 4,105 genes. It \nhas an intact Calvin cycle with two forms of Rubisco, as well as a gene encoding phosphoenolpyruvate carboxylase \n(PEPC) for mixotrophic CO2 fixation. This dual carbon-fixation system may be required for regulating internal carbon \nflux to facilitate bacterial nitrogen assimilation. Enzymatic reactions associated with arsenate and mercuric \ndetoxification are rare or unique compared to other purple bacteria. Among numerous newly identified signal \ntransduction proteins, of particular interest is a putative bacteriophytochrome that is phylogenetically distinct from a \npreviously characterized R. centenum phytochrome, Ppr. Genes encoding proteins involved in chemotaxis as well as a \nsophisticated dual flagellar system have also been mapped. \nConclusions: Remarkable metabolic versatility and a superior capability for photoautotrophic carbon assimilation is \nevident in R. centenum.
Language: English
Subfield: Molecular Biology
Domain: Life Sciences
Open Access status: green
Funder: National Science Foundation
OpenAlex ID: W2211960870
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