title: [Endocellular aminopeptidase from Astasia longa].
abstract: A new aminopeptidase was isolated from the biomass of the flagellate Astasia longa by precipitation with ammonium sulfate, gel filtration, and affinity chromatography on Arginine-Silochrome in 41% yield and with purification degree 490. The enzyme is irreversible inhibited by mercury chloride, EDTA, o-phenanthroline and, partially, bestatin and zinc chloride. It has an optimum pH 8.5 toward the hydrolysis of a synthetic chromogenic substrate Ala-pNA. The enzyme molecular mass is 45 kDa, isoelectric point 5.5, and temperature optimum 45 degrees C. The enzyme most effectively hydrolyzes p-nitroanilides of alanine, arginine, and leucine; it is classified as metalloaminopeptidase.
authors.forename: Iu A
authors.initials: IuA
authors.lastname: Rudenskaia
authors.forename: V V
authors.initials: VV
authors.lastname: Aseev
authors.forename: G N
authors.initials: GN
authors.lastname: Rudensaia
mesh_terms: D000626:Aminopeptidases / Q000037:antagonists & inhibitors / Q000737:chemistry / Q000302:isolation & purification*; D000814:Aniline Compounds / Q000737:chemistry; D044802:Euglena longa / Q000201:enzymology*; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D007526:Isoelectric Point; D013379:Substrate Specificity
chemical_list: D000814:Aniline Compounds; C004813:alanine-4-nitroanilide; D000626:Aminopeptidases