Mobilization of poly(3-hydroxybutyrate) in Ralstonia eutropha

Ralstonia eutropha H16 degraded (mobilized) previously accumulated poly(3-h ydroxybutyrate) (PHB) in the absence of an exogenous carbon source and used the degradation products for growth and survival. Isolated native PHB gran ules of mobilized R. eutropha cells released 3-hydroxybutyrate (3HB) at a t hreefold higher rate than did control granules of nonmobilized bacteria. Na 3HB was released by native PHB granules of recombinant Escherichia call ex pressing the PHB biosynthetic genes. Native PHB granules isolated from chro mosomal kockout mutants of an intracellular PHB (i-PHB) depolymerase gene o f R. eutropha H16 and HF210 showed a reduced but not completely eliminated activity of 3HB release and indicated the presence of i-PHB depolymerase is oenzymes.