Abstract:
:Microbial transformation of arsenic species and their interaction with the carbon cycle play a major role in the mobility of this toxic metalloid in the environment. The influence of simple or complex organic substrates on arsenic bio-oxidation was studied using two bacterial strains: one - the arsenivorans strain of Thiomonas delicata - is able to use AsIII as sole energy source; the other, Herminiimonas arsenicoxydans, is not. Experiments were performed at two AsIII concentrations (75 and 2 mg/L). At 75 mg/L As, for both strains, expression of aioA gene decreased when yeast extract concentration was raised from 0.2 to 1 g/L. At 2 mg/L As, the presence of either yeast extract or simple (succinate or acetate) organic substrates in the medium during bacterial growth decreased the AsIII-oxidation rate by both strains. When added specifically during oxidation test, yeast extract but not simple organic substrates seems to have a negative effect on AsIII oxidation. Taken together, results confirm the negative influence of simple or complex organic substrates on the kinetics of microbial AsIII oxidation and suggest that this effect results from different mechanisms depending on the type of organic substrate. Further, for the first time, the influence of a complex organic substrate, yeast extract, on aioA gene expression has been evidenced.
journal_name
Res Microbioljournal_title
Research in microbiologyauthors
Lescure T,Joulian C,Charles C,Ben Ali Saanda T,Charron M,Breeze D,Bauda P,Battaglia-Brunet Fdoi
10.1016/j.resmic.2019.09.006subject
Has Abstractpub_date
2020-01-01 00:00:00pages
13-20issue
1eissn
0923-2508issn
1769-7123pii
S0923-2508(19)30100-7journal_volume
171pub_type
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