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- W1586550223 abstract "Abstract Human placental estradiol-17beta dehydrogenase is rapidly inactivated upon treatment with 3-bromoacetoxyestrone. Pseudo-first order kinetic data are obtained and inactivation is accompanied by incorporation of 1 mol of 3-acetoxyestrone/mol of subunit (Mr =34,000). Treatment of the inactivated enzyme with (4S)-[4-2H]DPNH results in the formation of covalently bound [17alpha-2H]estradiol-17beta, which can be released by hydrolysis and identified by gas chromatography-mass sepctrometry. When (4R)-[4-2H]DPNH was used, deuterium was not transferred. Thus, the normal stereochemistry of hydridetransfer is preserved for both partners. After treatment with p-mercuribenzoate, affinity-labeled estradiol-17beta dehyrogenase is no longer able to caralyze reduction its covalently bound estrone; in the presence of DPNH and native enzyme, however, reduction occurs, demonstrating that affinity-labeled enzyme can itself serve as subtrate for native estradiol-17beta dehydrogenase. The reversible enzymatic interconversion of covalently bound estrone was demonstrated using a transhydrogenase assay. The ability of an enzyme to catalyze its normal reaction with a covalently bound substrate is termed catalytic competence, and is considered to be a new criterion for affinity labeling." @default.
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- W1586550223 date "1975-07-01" @default.
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- W1586550223 title "Catalytic competence, a new criterion for affinity labeling. Demonstration of the reversible enzymatic interconversion of estrone and estradiol-17 beta covalently bound to human placental estradiol-17 beta dehydrogenase." @default.
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- W1586550223 doi "https://doi.org/10.1016/s0021-9258(19)41202-7" @default.
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