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- W2531809521 abstract "Extensive application of synthesized organophosphorus compounds (OPs) leads to pollutant accumulation and enhanced eco-toxicity. Hydrolysis of phosphotriester bonds catalyzed by evolved microbial enzymes is a key step for detoxification of OPs. Here, a new marine bacterial prolidase OPAA4301 exhibiting promiscuous phosphotriesterase activity was isolated and systematically characterized. The homo-tetrameric enzyme OPAA4301 can catalyze the hydrolysis of both amido bond and phosphotriester bond. Manganese ions were observed to be essential for its catalytic integrity, and in vitro substitution of manganese ions by different metal cofactors led to decreased activity. We also revealed cooperation pattern of metal ligands and substrate-binding residues on OP hydrolysis by mutational analysis. Metal-binding sites together with Arg418 in the large-binding pocket of the enzyme were found to be indispensable for catalytic ability. Substitution mutation of small- and large-binding pocket residues caused significant variation in phosphotriesterase activity, and leaving group sites appeared to be involved in the catalytic process as substrate affinity regulators. Our study gave an overall biochemical understanding on the organophosphorus hydrolysis pattern of the newly identified marine bacterial prolidase and provided ideas for protein engineering to expand its application in the bioremediation field." @default.
- W2531809521 created "2016-10-21" @default.
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- W2531809521 date "2017-01-01" @default.
- W2531809521 modified "2023-10-14" @default.
- W2531809521 title "Biochemical basis for hydrolysis of organophosphorus by a marine bacterial prolidase" @default.
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- W2531809521 doi "https://doi.org/10.1016/j.procbio.2016.10.008" @default.
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