ID   3.1.1.75
DE   poly(3-hydroxybutyrate) depolymerase.
AN   PHB depolymerase.
AN   poly(3HB) depolymerase.
AN   poly(HA) depolymerase.
AN   poly(HASCL) depolymerase.
AN   poly[(R)-hydroxyalkanoic acid] depolymerase.
CA   (1) [(3R)-hydroxybutanoate](n) + H2O = (R)-3-hydroxybutanoate + [(3R)-
CA   hydroxybutanoate](n-1) + H(+).
CA   (2) [(3R)-hydroxybutanoate](n) + H2O = (3R)-hydroxybutanoate dimer +
CA   [(3R)-hydroxybutanoate](n-2) + H(+).
CA   (3) [(3R)-hydroxybutanoate](n) + H2O = (3R)-hydroxybutanoate trimer +
CA   [(3R)-hydroxybutanoate](n-3) + H(+).
CA   (4) [(3R)-hydroxybutanoate](n) + H2O = (3R)-hydroxybutanoate tetramer +
CA   [(3R)-hydroxybutanoate](n-4) + H(+).
CA   (5) [(3R)-hydroxybutanoate](n) + H2O = (3R)-hydroxybutanoate pentamer +
CA   [(3R)-hydroxybutanoate](n-5) + H(+).
CC   -!- Reaction also occurs with esters of other short-chain-length (C1-C5)
CC       hydroxyalkanoic acids (HA).
CC   -!- There are two types of polymers: native (intracellular) granules are
CC       amorphous and have an intact surface layer; denatured (extracellular)
CC       granules either have no surface layer or a damaged surface layer and
CC       are partially crystalline.
DR   B2NHN2, PHAZ_TALFU ;  O05527, PHB_DELAC  ;  P12625, PHB_RALPI  ;
//