Esterase, PHB depolymerase bacterial depolymerases for poly(3-hydroxybutyrate) (PHB) and related polyhydroxyalkanoates (PHA), as well as acetyl xylan esterases, and feruloyl esterases from fungi.TIGR01840 esterase_phb. This family is included in the Carbohydrate Esterase family CE1 in CAZy - Carbohydrate-Active enZYmes database (CE_1). Feruloyl esterases are distributed in different sub-classes type-A B C,D and E and fall respectively in the following families. Type-A in Lipase_3, Type-B in Esterase_phb (PHB depolymerase), Type-C in Tannase, Type-D in FaeC, Type-E in A85-Feruloyl-Esterase, Type-F in BD-FAE (CE1_SF2.2 in Li et al.2020)