title: Two high molecular mass proteases from sea urchin sperm.
abstract: Two-types of high molecular mass proteases have been purified from sea urchin sperm using DEAE-Sephacel, hydroxylapatite and Superdex 200 column chromatography. Both proteases showed similar hydrolyzing activities toward synthetic peptides, but they differed in the molecular mass and peptide composition. One was probably identical to a proteasome (multicatalytic proteinase), judging from its molecular mass (650 kDa) and polypeptide composition. The other one was composed of several polypeptides with molecular masses ranging from 24 kDa to 125 kDa and its molecular mass was estimated as 950 kDa by gel filtration. These two proteases, however, were closely related to each other. Immunological studies revealed that the 950-kDa protease comprised at least five subunits of the 650-kDa protease.
authors.affiliation: Misaki Marine Biological Station, Faculty of Science, University of Tokyo, Kanagawa, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Inaba
authors.forename: Y
authors.initials: Y
authors.lastname: Akazome
authors.forename: M
authors.initials: M
authors.lastname: Morisawa
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002845:Chromatography / Q000379:methods; D002850:Chromatography, Gel / Q000379:methods; D002852:Chromatography, Ion Exchange / Q000379:methods; D003546:Cysteine Endopeptidases / Q000302:isolation & purification* / Q000378:metabolism; D017886:Durapatite; D004591:Electrophoresis, Polyacrylamide Gel; D010450:Endopeptidases / Q000302:isolation & purification* / Q000378:metabolism; D006882:Hydroxyapatites; D007700:Kinetics; D046911:Macromolecular Substances; D008297:Male; D008969:Molecular Sequence Data; D008970:Molecular Weight; D009097:Multienzyme Complexes / Q000302:isolation & purification* / Q000378:metabolism; D009842:Oligopeptides / Q000138:chemical synthesis / Q000378:metabolism; D011480:Protease Inhibitors / Q000494:pharmacology; D046988:Proteasome Endopeptidase Complex; D012617:Sea Urchins; D013094:Spermatozoa / Q000201:enzymology*; D013379:Substrate Specificity
chemical_list: D006882:Hydroxyapatites; D046911:Macromolecular Substances; D009097:Multienzyme Complexes; D009842:Oligopeptides; D011480:Protease Inhibitors; D017886:Durapatite; D010450:Endopeptidases; D003546:Cysteine Endopeptidases; D046988:Proteasome Endopeptidase Complex