D-(-)-3-hydroxybutyrate oligomer hydrolase (also known as 3HB-oligomer hydrolase) functions in the degradation of poly-3-hydroxybutyrate (PHB). It catalyses the hydrolysis of D(-)-3-hydroxybutyrate oligomers (3HB-oligomers) into 3HB-monomers.

1: Cloning of an intracellular D(-)-3-hydroxybutyrate-oligomer hydrolase gene from Ralstonia eutropha H16 and identification of the active site serine residue by site-directed mutagenesis. Saegusa H, Shiraki M, Saito T; J Biosci Bioeng. 2002;94:106-112. PMID:16233278

2: Roles of poly(3-hydroxybutyrate) depolymerase and 3HB-oligomer hydrolase in bacterial PHB metabolism. Sugiyama A, Kobayashi T, Shiraki M, Saito T; Curr Microbiol. 2004;48:424-427. PMID:15170237