Jingxin Li, Gejiao Wang, and colleagues identify AnoA, an oxidoreductase in Agrobacterium tumefaciens GW4 that oxidizes antimonite. The copy in hand is the accepted manuscript posted before final pagination. Deletion of anoA reduced Sb(III) oxidation by about 27%. Over-expression increased oxidation by about 34%. This is microbial biochemistry, not a food measurement. The PDF prints DOI 10.1021/es506318b.
Key numbers
Purified AnoA had a Km for Sb(III) of 64 ± 10 µM and a Vmax of 150 ± 7 nmol min−1 mg−1, with NADP+ as cofactor. One assay incubated the enzyme with 5 mM Sb(III). Cultures of A. tumefaciens were grown with 0 or 50 µM Sb(III), supplied as K2Sb2(C4H2O6)2. A 50 mM concentration in the methods is Tris buffer.
Methods (brief)
Proteomics and gene deletion in A. tumefaciens, with heterologous expression in E. coli.
Evidence fitness
The kinetic constants support a description of this enzyme. They do not support a food or water concentration.
Limitations
Just Accepted manuscript rather than the final paginated article.
Related evidence
Update history
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