Acetylates soluble but not nucleosomal histone H4 at 'Lys-5' (H4K5ac) and 'Lys-12' (H4K12ac) and, to a lesser extent, acetylates histone H2A at 'Lys-5' (H2AK5ac). Has intrinsic substrate specificity that modifies lysine in recognition sequence GXGKXG. May be involved in nucleosome assembly during DNA replication and repair as part of the histone H3.1 and H3.3 complexes.
Specificity
Natural and recombinant Rat Histone acetyltransferase type B catalytic subunit
Catalytic subunit of the type B histone acetlytransferase (HAT) complex, composed of RBBP7 and HAT1. Interacts with histones H4 and H2A. The interaction is dependent of the ability of RBBP7 to bind to the N-terminus of histones. Component of the histone H3.1 and H3.3 complexes.