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pubmed-article:2835095pubmed:abstractTextThe reaction mechanism for the phosphotriesterase from Pseudomonas diminuta has been examined. When paraoxon (diethyl 4-nitrophenyl phosphate) is hydrolyzed by this enzyme in oxygen-18-labeled water, the oxygen-18 label is found exclusively in the diethyl phosphate product. The absolute configurations for the (+) and (-) enantiomers of O-ethyl phenylphosphonothioic acid have been determined by X-ray diffraction structural determination of the individual crystalline 1-phenylethylamine salts. The (+) enantiomer of the free acid corresponds to the RP configuration. The RP enantiomer of O-ethyl phenylphosphonothioic acid has been converted to the SP enantiomer of EPN [O-ethyl O-(4-nitrophenyl) phenylphosphonothioate]. (SP)-EPN is hydrolyzed by the phosphotriesterase to the SP enantiomer of O-ethyl phenylphosphonothioic acid. The enzymatic reaction therefore proceeds with inversion of configuration. These results have been interpreted as an indication of a single in-line displacement by an activated water molecule directly at the phosphorus center of the phosphotriester substrate. (RP)-EPN is not hydrolyzed by the enzyme at an appreciable rate.lld:pubmed
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pubmed-article:2835095pubmed:authorpubmed-author:WildJ RJRlld:pubmed
pubmed-article:2835095pubmed:authorpubmed-author:RaushelF MFMlld:pubmed
pubmed-article:2835095pubmed:authorpubmed-author:LewisV EVElld:pubmed
pubmed-article:2835095pubmed:authorpubmed-author:DonarskiW JWJlld:pubmed
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pubmed-article:2835095pubmed:pagination1591-7lld:pubmed
pubmed-article:2835095pubmed:dateRevised2008-11-21lld:pubmed
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pubmed-article:2835095pubmed:year1988lld:pubmed
pubmed-article:2835095pubmed:articleTitleMechanism and stereochemical course at phosphorus of the reaction catalyzed by a bacterial phosphotriesterase.lld:pubmed
pubmed-article:2835095pubmed:affiliationDepartment of Chemistry, Texas A&M University, College Station 77843.lld:pubmed
pubmed-article:2835095pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:2835095pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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