title: Isolation and properties of a metalloproteinase from buckwheat (Fagopyrum esculentum) seeds.
abstract: A homogeneous preparation of metalloproteinase, purified 1000-fold, was obtained from buckwheat (Fagopyrum esculentum) seeds. The Mr of the enzyme, determined by SDS/PAGE, was 34,000 (it was 39,000 by gel chromatography). Its pH optimum was 8.0-8.2 with 13 S globulin, from buckwheat seeds, as substrate. Atomic-absorption spectroscopy revealed the presence of one Zn2+ ion per enzyme molecule. The enzyme was completely inhibited by EDTA (1 mM), zincone (1 mM) and 1, 10-phenanthroline (1 mM). The metalloproteinase performed limited proteolysis of the following seed storage proteins: 13 S globulin from buckwheat seeds and 11 S globulin from soybean (Glycine max) seeds. It hydrolysed three peptide bonds formed by the amino groups of Leu15, Tyr16 and Phe25 in the oxidized B-chain of insulin. In its main properties the enzyme is similar to metalloproteinases of animal and bacterial origin.
authors: A.N. Belozersky Laboratory of Molecular Biology and Bioorganic Chemistry, Moscow State University, U.S.S.R.
authors: M A
authors: MA
authors: Belozersky
authors: Y E
authors: YE
authors: Dunaevsky
authors: N E
authors: NE
authors: Voskoboynikova
mesh_terms: D000595:Amino Acid Sequence; D002850:Chromatography, Gel; D002852:Chromatography, Ion Exchange; D002523:Edible Grain / Q000201:enzymology*; D004591:Electrophoresis, Polyacrylamide Gel; D007328:Insulin / Q000378:metabolism; D046911:Macromolecular Substances; D008666:Metalloendopeptidases / Q000302:isolation & purification* / Q000378:metabolism; D008969:Molecular Sequence Data; D008970:Molecular Weight; D009842:Oligopeptides / Q000378:metabolism; D012639:Seeds / Q000201:enzymology*; D013379:Substrate Specificity
chemical_list: D007328:Insulin; D046911:Macromolecular Substances; D009842:Oligopeptides; D008666:Metalloendopeptidases