Calf liver nuclear N-acetyltransferases. Purification and properties of two enzymes with both spermidine acetyltransferase and histone acetyltransferase activities.

作者: P.R. Libby

DOI: 10.1016/S0021-9258(17)38293-5

关键词: HistoneSpermidineEnzymeBiologyAcetylationAcetyltransferaseBiochemistrySpermidine acetylationHistone acetyltransferase activityMolecular biologyHistone acetyltransferase

摘要: Calf liver contains two nuclear N-acetyltransferases which are separated by chromatography on hydroxylapatite. Both acetyltransferase A and B will transfer acetate from acetyl-CoA to either histone or spermidine. The same protein catalyzes the reaction with both substrates; this is shown a constant ratio of spermidine activity over 5,000-fold purification identical heat denaturation kinetics for each enzyme. Histone preferentially acetylated when acceptors present. enzymes acetylate polyamines (spermidine, spermine, diaminodipropylamine) diamines. Acetyltransferase acetylates histones in order: whole greater than H4 H2A H3 H2B H1; = H1. Michaelis constants 2 X 10(-4)M 9 10(-6)M acetyl-CoA. has molecular weight 150,000; 175,000. strongly inhibited p-chloromercuribenzoate weakly EDTA.

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