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  • Title: Partial purification and properties of N-acetylhistamine deacetylase.
    Author: Endo Y.
    Journal: Biochim Biophys Acta; 1976 Jul 08; 438(2):532-9. PubMed ID: 952945.
    Abstract:
    The enzyme catalyzing the deacetylaction of N-acetylhistamine was partially purified about 160-fold from rat liver extract and its properties were investigated. The purification procedure included DEAE-cellulose chromatography, precipitation with ammonium sulfate and DEAE-cellulose rechromatography. The enzyme contains a labile -SH group that is essential for its activity. Mn2+ and Co2+ enhanced the deacetylation reaction at low concentration. The molecular weight of the deacetylase was estimated to be about 70 000 from gel-filtration. Among various acetyl derivatives tested so far, N-acetylhistamine and to a lesser extent N-acetyltyramine served as the substrates. The Km value was 0.3 mM at the optimum pH 8.0 for N-acetylhistamine. Diphenhysramine, an antihistaminergic agent, inhibited the deacetylation remarkably.
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