title: A fibrinolytic metalloprotease from the fruiting bodies of an edible mushroom, Armillariella mellea.
abstract: A fibrinolytic metalloprotease has been purified from the fruiting bodies of the edible honey mushroom (Armillariella mellea). The enzyme has a molecular weight of 18538.1508, as measured by MALDI-TOF mass spectrometry and includes Zn2+ ion as found by ICP/MS. The N-terminal amino acid sequence, XXYNGXTXSRQTTLV, do not match any known protein or open reading frame. It hydrolyzes fibrinogen as well as fibrin, but does not show any proteolytic activity for other blood proteins such as thrombin, human albumin, bovine albumin, human IgG, hemoglobin, or urokinase. This protease hydrolyzes both A alpha and B beta subunits of human fibrinogen with equal efficiency. The enzyme activity was strongly inhibited by EDTA and 1,10-phenanthroline, indicating that the enzyme is a metalloprotease. No inhibition was found with PMSF, E-64, pepstatin, and 2-mercaptoethanol. The activity of the purified enzyme was slightly increased by Mg2+, Zn2+, and Co2+, but the enzyme was totally inhibited by Hg2+. It has broad substrate specificity for synthetic peptides, and a pH optimum at 7, suggested that the purified enzyme was a neutral protease. It was thermally stable up to 60 degrees C and the maximum fibrinolytic activity was at 55 degrees C.
authors.affiliation: Department of Chemistry, Sangji University, Wonju, Korea.
authors.forename: J H
authors.initials: JH
authors.lastname: Kim
authors.forename: Y S
authors.initials: YS
authors.lastname: Kim
mesh_terms: D000363:Agaricales / Q000201:enzymology*; D000595:Amino Acid Sequence; D000818:Animals; D002417:Cattle; D002614:Chelating Agents / Q000494:pharmacology; D004492:Edetic Acid / Q000494:pharmacology; D004591:Electrophoresis, Polyacrylamide Gel; D005342:Fibrinolysis; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008666:Metalloendopeptidases / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism; D008969:Molecular Sequence Data; D008970:Molecular Weight; D010618:Phenanthrolines / Q000494:pharmacology; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013379:Substrate Specificity; D013696:Temperature; D015032:Zinc / Q000378:metabolism
chemical_list: D002614:Chelating Agents; D010618:Phenanthrolines; D004492:Edetic Acid; D008666:Metalloendopeptidases; D015032:Zinc; C025205:1,10-phenanthroline