title: Complete genome sequence of Desulfocapsa sulfexigens, a marine deltaproteobacterium specialized in disproportionating inorganic sulfur compounds.
abstract: Desulfocapsa sulfexigens SB164P1 (DSM 10523) belongs to the deltaproteobacterial family Desulfobulbaceae and is one of two validly described members of its genus. This strain was selected for genome sequencing, because it is the first marine bacterium reported to thrive on the disproportionation of elemental sulfur, a process with a unresolved enzymatic pathway in which elemental sulfur serves both as electron donor and electron acceptor. Furthermore, in contrast to its phylogenetically closest relatives, which are dissimilatory sulfate-reducers, D. sulfexigens is unable to grow by sulfate reduction and appears metabolically specialized in growing by disproportionating elemental sulfur, sulfite or thiosulfate with CO2 as the sole carbon source. The genome of D. sulfexigens contains the set of genes that is required for nitrogen fixation. In an acetylene assay it could be shown that the strain reduces acetylene to ethylene, which is indicative for N-fixation. The circular chromosome of D. sulfexigens SB164P1 comprises 3,986,761 bp and harbors 3,551 protein-coding genes of which 78% have a predicted function based on auto-annotation. The chromosome furthermore encodes 46 tRNA genes and 3 rRNA operons.
authors: Bioscience-Microbiology Section, Aarhus University, Ny Munkegade 116, Dk-8000 Aarhus C, Denmark.
authors: Kai Waldemar
authors: KW
authors: Finster
authors: Kasper Urup
authors: KU
authors: Kjeldsen
authors: Michael
authors: M
authors: Kube
authors: Richard
authors: R
authors: Reinhardt
authors: Marc
authors: M
authors: Mussmann
authors: Rudolf
authors: R
authors: Amann
authors: Lars
authors: L
authors: Schreiber
keywords: Sulfur-cycle; marine; sediment; sulfite; sulfur disproportionation; thiosulfate
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