title: Purification and properties of a beta-glucosidase from Penicillium oxalicum autolysates.
abstract: A beta-glucosidase from the medium of an autolyzed culture of Penicillium oxalicum has been purified by tannic acid precipitation, sephacryl S-200, DEAE-Biogel, CM-Biogel and Mono Q successively. The purification process produced a homogeneous band in the SDS-PAGE that correspond to a Mr of 133,500. The enzyme had a pl of 4, and the active optima were found at pH 5.5 and 55 degrees C. The enzyme hydrolyzed different substrates showing maximum affinity against p-nitrophenyl-beta-D-glucoside with a Km value of 0.37 mM. The beta-glucosidase was inhibited by Glucono-D-lactone but not by glucose in the concentration range of 1 to 10 mM. The enzyme was adsorbed by Concanavalin-A-Sepharose.
authors.affiliation: Departamento de Microbiología y Parasitología, Universidad Alcalá de Henares, Madrid, Spain.
authors.forename: J L
authors.initials: JL
authors.lastname: Copa-Patiño
authors.forename: J
authors.initials: J
authors.lastname: Rodriguez
authors.forename: M I
authors.initials: MI
authors.lastname: Pérez-Leblic
mesh_terms: D005959:Glucosidases / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008970:Molecular Weight; D010407:Penicillium / Q000201:enzymology*; D013379:Substrate Specificity; D001617:beta-Glucosidase / Q000037:antagonists & inhibitors / Q000302:isolation & purification* / Q000378:metabolism
chemical_list: D005959:Glucosidases; D001617:beta-Glucosidase