Selenite reduction by Shewanella oneidensis MR-1 is mediated by fumarate reductase in periplasm.

ABSTRACT: In situ reduction of selenite to elemental selenium (Se(0)), by microorganisms in sediments and soils is an important process and greatly affects the environmental distribution and the biological effects of selenium. However, the mechanism behind such a biological process remains unrevealed yet. Here we use Shewanella oneidensis MR-1, a widely-distributed dissimilatory metal-reducing bacterium with a powerful and diverse respiration capability, to evaluate the involvement of anaerobic respiration system in the microbial selenite reduction. With mutants analysis, we identify fumarate reductase FccA as the terminal reductase of selenite in periplasm. Moreover, we find that such a reduction is dependent on central respiration c-type cytochrome CymA. In contrast, nitrate reductase, nitrite red

SUBMITTER: Li DB 

PROVIDER: S-EPMC3894562 | biostudies-literature | 2014 Jan

REPOSITORIES: biostudies-literature