C-terminus of bacterial poly(3-hydroxybutyrate) (PHB) de-polymerase. This enzyme degrades PHB granules to oligomers and monomers of 3-hydroxy-butyric acid. Intracellular depolymerase for polyhydroxyalkanoate (PHA), a carbon and energy storing polyester that accumulates in granules in many bacterial species when carbon sources are abundant but other nutrients are limiting.