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- W2090610366 abstract "Vitamin K dependent carboxylase (carboxylase) is a membrane-associated endoplasmic reticular enzyme that catalyzes the conversion of certain glutamate residues of essential blood coagulation proteins to gamma-carboxyglutamyl (Gla) residues. A series of N-bromoacetyl-peptide substrate affinity labels based on the Gla domain of these blood-clotting proteins was synthesized, and the substrate and inactivator kinetic parameters were assessed. The most promising of these affinity peptides, N-bromoacetyl-FLEELY, was both substrate for carboxylase and an irreversible time-dependent inactivator of the enzyme, inactivating 80% of carboxylase under pseudo-first-order conditions. Addition of saturating amounts of a competing peptide substrate completely abolished the inhibitory properties of N-bromoacetyl-FLEELY, consistent with inactivation occurring at the active site. The partition ratio of inactivation/carboxylation was 1/30. The 94-kDa carboxylase was purified to 15-50% purity by a modification of a recent protocol [Wu, S.-M., Morris, D. P., & Stafford, D. W. (1991) Proc. Natl. Acad. Sci. U.S.A. 88, 2236-2240] and covalently labeled with N-bromoacetyl-FLEEL[125I]Y. On silver-stained 10% sodium dodecyl sulfate-polyacrylamide gels, the predominant radiolabeled band was the 94,000 molecular weight species. This result independently validates that the 94-kDa protein is a carboxylase." @default.
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- W2090610366 date "1992-10-01" @default.
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- W2090610366 title "N-Bromoacetyl-peptide substrate affinity labeling of vitamin K dependent carboxylase" @default.
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- W2090610366 doi "https://doi.org/10.1021/bi00154a016" @default.
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