title: Sedimenticola selenatireducens, gen. nov., sp. nov., an anaerobic selenate-respiring bacterium isolated from estuarine sediment.
abstract: The respiration of selenate, as a terminal electron acceptor has been known for over a decade, but the microorganisms involved in this respiration are largely unknown. Here we characterize a novel selenate-respiring bacterium, strain AK4OH1, isolated from an estuarine sediment enrichment culture. Strain AK4OH1 has the unique capability to oxidize aromatic acids, such as benzoate, 4-hydroxybenzoate and 3-hydroxybenzoate, coupled to selenate respiration. This novel respiratory coupling has not been described before. Reduction of selenate is followed by stoichiometric accumulation of selenite. The strain grows in agar shake tubes forming bright red colonies due to precipitation of elemental selenium. Strain AK4OH1 is a strictly anaerobic bacterium, which can also respire nitrate and nitrite via denitrification. Analysis of the 16S rRNA gene sequence shows that this strain clusters with another selenate-reducing bacterium and a (per) chlorate reducing bacterium, within the Gammaproteobacteria, along with symbionts of bivalves and tubeworms. Based on its unique physiological capabilities and its 16S rRNA gene sequence phylogeny, we classify this strain AK4OH1 as a new genus and species with the proposed name Sedimenticola selenatireducens.
authors.affiliation: Department of Biochemistry and Microbiology, Biotechnology Center for Agriculture and the Environment, Cook College, Rutgers, State University of New Jersey, 76 Lipman Drive, New Brunswick, NJ 08901-8525, USA.
authors.forename: Priya
authors.initials: P
authors.lastname: Narasingarao
authors.forename: Max M
authors.initials: MM
authors.lastname: Häggblom
mesh_terms: D001483:Base Sequence; D001565:Benzoates / Q000378:metabolism; D020563:Gammaproteobacteria / Q000302:isolation & purification* / Q000378:metabolism; D019015:Geologic Sediments / Q000382:microbiology*; D016965:Gram-Negative Anaerobic Straight, Curved, and Helical Rods / Q000302:isolation & purification* / Q000378:metabolism; D062385:Hydroxybenzoates / Q000378:metabolism; D008969:Molecular Sequence Data; D010226:Parabens / Q000378:metabolism; D012336:RNA, Ribosomal, 16S / Q000032:analysis; D064586:Selenic Acid; D018036:Selenium Compounds / Q000378:metabolism*
chemical_list: D001565:Benzoates; D062385:Hydroxybenzoates; D010226:Parabens; D012336:RNA, Ribosomal, 16S; D018036:Selenium Compounds; C032948:3-hydroxybenzoic acid; D064586:Selenic Acid; C038193:4-hydroxybenzoic acid