The structure of this domain displays an alpha-beta-beta-alpha four layer topology, with an HxHxxxxxxxxxH motif that coordinates a zinc ion, and an acetate anion at a site that likely supports the enzymatic activity of an ester hydrolase [1].

1: Crystal structure of Homo sapiens PTD012 reveals a zinc-containing hydrolase fold. Manjasetty BA, Bussow K, Fieber-Erdmann M, Roske Y, Gobom J, Scheich C, Gotz F, Niesen FH, Heinemann U; Protein Sci. 2006;15:914-920. PMID:16522806