Histone acetyltransferase type B catalytic subunit (HAT1) is the catalytic subunit of the histone acetylase B (HAT-B) complex (composed on HAT1 and HAT2 at least) [1-2]. It DNA double-strand break repair. Yeast HAT1 specifically acetylates H4 at Lys5 and Lys12 residues. The C-terminal domain of HAT1 is highly variable and not required for HAT activity [1]. It consists of a bundle of helices and a short beta-strand. This entry includes HAT1 from Fungi.

1: Structure of the histone acetyltransferase Hat1: a paradigm for the GCN5-related N-acetyltransferase superfamily. Dutnall RN, Tafrov ST, Sternglanz R, Ramakrishnan V; Cell. 1998;94:427-438. PMID:9727486

2: Hat2p recognizes the histone H3 tail to specify the acetylation of the newly synthesized H3/H4 heterodimer by the Hat1p/Hat2p complex. Li Y, Zhang L, Liu T, Chai C, Fang Q, Wu H, Agudelo Garcia PA, Han Z, Zong S, Yu Y, Zhang X, Parthun MR, Chai J, Xu RM, Yang M; Genes Dev. 2014;28:1217-1227. PMID:24835250