Summary Strain MPA ‐ C3 was isolated by incubating arsenic‐bearing sediments under anaerobic, mesophilic conditions in minimal media with acetate as the sole source of energy and carbon, and A s( V ) as the sole electron acceptor. Following growth and the respiratory reduction of A s( V ) to A s( III ), a yellow precipitate formed in active cultures, while no precipitate was observed in autoclaved controls, or in uninoculated...

Summary Desulfurispirillum indicum strain S5, a novel obligate anaerobe belonging to the phylum Chrysiogenetes , is a dissimilatory selenate‐, selenite‐, arsenate‐, nitrate‐ and nitrite‐reducing bacterium. The circular genome of this metabolically versatile bacterium is 2.9 Mbp, with a G+C content of 56.1% and 2619 predicted protein‐coding genes. Genome analysis uncovered the components of the electron transport chain, providi...

Summary In this study, we investigated the role of menaquinone biosynthesis genes in selenate reduction by Enterobacter cloacae SLD1a‐1 and Escherichia coli K12. A mini‐Tn5 transposon mutant of E. cloacae SLD1a‐1, designated as 4E6, was isolated that had lost the ability to reduce Se(VI) to Se(0). Genetic analysis of mutant strain 4E6 showed that the transposon was inserted within a menD gene among a menFDHBCE gene cluster tha...