作者: P.R. Libby
DOI: 10.1016/S0021-9258(17)38293-5
关键词: Histone 、 Spermidine 、 Enzyme 、 Biology 、 Acetylation 、 Acetyltransferase 、 Biochemistry 、 Spermidine acetylation 、 Histone acetyltransferase activity 、 Molecular biology 、 Histone 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.