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- W1555092004 abstract "Vacuolar proton-translocating ATPase from bovine kidney was purified in one step by immunoprecipitation and immunoaffinity chromatography using an immobilized anti-H+ATPase monoclonal antibody. The monoclonal antibody affinity matrix coprecipitated polypeptides with Mr of 70,000, a cluster at 56,000, 45,000, 42,000, 38,000, 33,000, 31,000, 15,000, 14,000, and 12,000 from solubilized bovine kidney microsomal membranes, a pattern that was unaffected by different detergent washing conditions. A nearly identical pattern of polypeptides was observed in H+ATPase partially purified by an entirely independent method. The immunoaffinity purified H+ATPase had reconstitutively active ATP-induced acidification and potential generation that was inhibited by N-ethylamaleimide. The purified enzyme had specific activities as high as 3.1 mumol/min/mg protein, dual pH optima at 6.5 and 7.2, and a Km for ATP of 150 microM. The substrate preference was ATP greater than ITP much greater than UTP greater than GTP greater than CTP. The affinity purified H+ATPase was stimulated by phosphatidyl glycerol greater than phosphatidyl inositol much greater than phosphatidyl choline greater than phosphatidyl serine. The immunoaffinity purified enzyme did not require monovalent anions or cations for activity, and the divalent cation preference for activity was Mn, Mg much greater than Ca greater than Co much greater than Sr, Ba. The enzyme was not inhibited by ouabain, azide, or vanadate, but had kappa 1/2 inhibitory concentrations of 22.2 microM for N-ethylmaleimide, 14.9 microM for NBD-Cl, 4.9 microM for N,N'-dicyclohexylcarbodiimide, 13.8 microM for 4,4'-diisothiocyanatostilbene-2,2'-disulfonic acid, and 315 microM for Zn, values close to those for inhibition of proton transport in the native vesicles. The affinity purified kidney enzyme has similarities to but also significant differences in structural and enzymatic properties from those reported for other vacuolar H+ATPase." @default.
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- W1555092004 date "1987-11-01" @default.
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- W1555092004 title "Immunoaffinity purification and characterization of vacuolar H+ATPase from bovine kidney." @default.
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- W1555092004 doi "https://doi.org/10.1016/s0021-9258(18)47797-6" @default.
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