title: Amygdalin degradation by Mucor circinelloides and Penicillium aurantiogriseum: mechanisms of hydrolysis.
abstract: Mucor circinelloides LU M40 and Penicillium aurantiogriseum P 35 produce extracellular beta-glycosidases that are active on the cyanogenic glycoside amygdalin. From the culture broths of M. circinelloides, only one beta-glycosidase could be identified, while two different enzymes - both having amygdalase activity - were found in culture broths of P. aurantiogriseum. The study of the mechanism of hydrolysis of the beta-bis-glycoside amygdalin with purified enzymes from the two organisms indicated a possible sequential (two-step) reaction. In all cases, the first step of hydrolysis from amygdalin to prunasin was very rapid, while the second step from prunasin to cyanohydrin was much slower. No cyanohydrin lyase activity was found in the culture broths of either fungus.
authors.affiliation: Department of Pharmacology and Pathobiology, Royal Veterinary and Agricultural University, DK-1870 Frederiksberg C (Copenhagen), Denmark.
authors.forename: L
authors.initials: L
authors.lastname: Brimer
authors.forename: A R
authors.initials: AR
authors.lastname: Cicalini
authors.forename: F
authors.initials: F
authors.lastname: Federici
authors.forename: M
authors.initials: M
authors.lastname: Petruccioli
mesh_terms: D000678:Amygdalin / Q000378:metabolism*; D001673:Biodegradation, Environmental; D006868:Hydrolysis; D008970:Molecular Weight; D009089:Mucor / Q000378:metabolism*; D010407:Penicillium / Q000378:metabolism*; D001617:beta-Glucosidase / Q000302:isolation & purification / Q000378:metabolism
chemical_list: D000678:Amygdalin; D001617:beta-Glucosidase