title: Sulfide oxidation coupled to arsenate reduction by a diverse microbial community in a soda lake.
abstract: We characterized the arsenate-reducing, sulfide-oxidizing population of Mono Lake, California, by analyzing the distribution and diversity of rrnA, cbbL, and dissimilatory arsenate reductase (arrA) genes in environmental DNA, arsenate-plus sulfide-amended lake water, mixed cultures, and isolates. The arsenate-reducing community was diverse. An organism represented by an rrnA sequence previously retrieved from Mono Lake and affiliated with the Desulfobulbaceae (Deltaproteobacteria) appears to be an important member of the arsenate-reducing, sulfide-oxidizing community. Sulfide oxidation coupled with arsenate reduction appears to proceed via a two-electron transfer, resulting in the production of arsenite and an intermediate S compound that is subsequently disproportionated. A realgar-like As/S mineral was formed in some experiments.
authors.affiliation: Department of Marine Sciences, University of Georgia, Athens, GA 30602, USA. aquadoc@uga.edu
authors.forename: James T
authors.initials: JT
authors.lastname: Hollibaugh
authors.forename: Charles
authors.initials: C
authors.lastname: Budinoff
authors.forename: Ryan A
authors.initials: RA
authors.lastname: Hollibaugh
authors.forename: Briana
authors.initials: B
authors.lastname: Ransom
authors.forename: Nasreen
authors.initials: N
authors.lastname: Bano
mesh_terms: D001149:Arsenates / Q000378:metabolism*; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism; D004275:DNA, Ribosomal; D020564:Deltaproteobacteria / Q000145:classification* / Q000235:genetics / Q000254:growth & development / Q000302:isolation & purification; D017753:Ecosystem; D005618:Fresh Water / Q000382:microbiology*; D008969:Molecular Sequence Data; D010084:Oxidation-Reduction; D012336:RNA, Ribosomal, 16S; D017422:Sequence Analysis, DNA; D012965:Sodium Chloride; D013440:Sulfides / Q000378:metabolism*
chemical_list: D001149:Arsenates; D001426:Bacterial Proteins; D004275:DNA, Ribosomal; D012336:RNA, Ribosomal, 16S; D013440:Sulfides; D012965:Sodium Chloride; C025657:arsenic acid