Anoxygenic phototrophic arsenite oxidation by a Rhodobacter strain.
Journal
Environmental microbiology
ISSN: 1462-2920
Titre abrégé: Environ Microbiol
Pays: England
ID NLM: 100883692
Informations de publication
Date de publication:
08 2023
08 2023
Historique:
received:
05
12
2022
accepted:
18
03
2023
pmc-release:
01
08
2024
medline:
3
8
2023
pubmed:
29
3
2023
entrez:
28
3
2023
Statut:
ppublish
Résumé
Microbially mediated arsenic redox transformations are key for arsenic speciation and mobility in rice paddies. Whereas anaerobic anoxygenic photosynthesis coupled to arsenite (As(III)) oxidation has been widely examined in arsenic-replete ecosystems, it remains unknown whether this light-dependent process exists in paddy soils. Here, we isolated a phototrophic purple bacteria, Rhodobacter strain CZR27, from an arsenic-contaminated paddy soil and demonstrated its capacity to oxidize As(III) to arsenate (As(V)) using malate as a carbon source photosynthetically. Genome sequencing revealed an As(III)-oxidizing gene cluster (aioXSRBA) encoding an As(III) oxidase. Functional analyses showed that As(III) oxidation under anoxic phototrophic conditions correlated with transcription of the large subunit of the As(III) oxidase aioA gene. Furthermore, the non-As(III) oxidizer Rhodobacter capsulatus SB1003 heterologously expressing aioBA from strain CZR27 was able to oxidize As(III), indicating that aioBA was responsible for the observed As(III) oxidation in strain CZR27. Our study provides evidence for the presence of anaerobic photosynthesis-coupled As(III) oxidation in paddy soils, highlighting the importance of light-dependent, microbe-mediated arsenic redox changes in paddy arsenic biogeochemistry.
Identifiants
pubmed: 36978205
doi: 10.1111/1462-2920.16380
pmc: PMC10676076
mid: NIHMS1946554
doi:
Substances chimiques
Arsenic
N712M78A8G
arsenite
N5509X556J
Arsenites
0
Oxidoreductases
EC 1.-
Soil
0
Types de publication
Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
1538-1548Subventions
Organisme : NIGMS NIH HHS
ID : R35 GM136211
Pays : United States
Informations de copyright
© 2023 Applied Microbiology International and John Wiley & Sons Ltd.
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