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- W2075912124 abstract "The active-site sulfhydryl group in the enzyme thiosulfate sulfurtransferase (rhodanese; thiosulfate:cyanide sulfurtransferase; EC 2.8.1.1) is alkylated rapidly by iodoacetic acid in the free enzyme form, E, with complete loss of sulfurtransferase activity. Iodoacetic acid is completely ineffective with the sulfur-substituted form of the enzyme, ES. Iodoacetamide, on the other hand, has no effect on either enzyme form. The competitive enzyme inhibitor, toluenesulfonic acid, protects against inactivation in a strictly competitive way and analysis gives an apparent binding constant for toluenesulfonic acid of 12.5 mM, which is in agreement with studies of its effect on the catalyzed reaction. These results are taken to indicate that iodoacetic acid is an affinity analog for the substrate, thiosulfate, and inactivates because it can use the specific thiosulfate binding interactions, correctly orient its reactive center and displace intraprotein interactions which appear to protect the active-site sulfhydryl group in the E form." @default.
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- W2075912124 date "1982-04-01" @default.
- W2075912124 modified "2023-09-25" @default.
- W2075912124 title "The specificity of active-site alkylation by iodoacetic acid in the enzyme thiosulfate sulfurtransferase" @default.
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- W2075912124 doi "https://doi.org/10.1016/0167-4838(82)90499-x" @default.
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