Class II histone deacetylases Hos3 and related proteins
Fungal histone deacetylase Hos3 from Saccharomyces cerevisiae is a Zn-dependent enzyme belonging to HDAC class II. It catalyzes hydrolysis of an N(6)-acetyl-lysine residue of a histone to yield a deacetylated histone (EC 3.5.1.98). Histone acetylation/deacetylation process is important for mediation of transcriptional regulation of many genes. Histone deacetylases usually act via association with DNA binding proteins to target specific chromatin regions. Hos3 deacetylase is homodimer, in vitro it shows specificity to H4, H3 and H2A.
Comment:Active center contains inhibitor and a catalytic Zn ion that coordinates side chain atoms of two aspartates and one histidine, and a water molecule.
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