Probable protein deacetylase that catalyzes deacetylation of acetylated lysine residues. In vitro, exhibits high activity against artificial HDAC (histone deacetylase) substrates containing acetylated and trifluoroacetylated lysine residues. Is not able to deacetylate acetylated polyamines. Binds 1 zinc ion per subunit. Is inhibited by azobenzenes, stilbenes and arylazopyrazoles. Homotetramer; dimer of head-to-head dimers. Growth of a mutant strain lacking this gene in the presence of both acetylcadaverine and acetylputrescine is comparable to growth of the wild-type. The deletion mutant strain shows a 25% increase in biofilm biomass after 24 hours of incubation compared to wild-type cells. Could be a suitable photopharmacological target for photopharmacological antimicrobial chemotherapy using photoswitchable inhibitors. Belongs to the histone deacetylase family.