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  • Title: The action of alpha-mannosidase from Oerskovia sp. on the mannose-rich O-linked sugar chains of glycoproteins.
    Author: Bagiyan FG, Eneyskaya EV, Kulminskaya AA, Savel'ev AN, Shabalin KA, Neustroev KN.
    Journal: Eur J Biochem; 1997 Oct 01; 249(1):286-92. PubMed ID: 9363781.
    Abstract:
    Alpha-mannosidase was isolated from the culture liquid of Oerskovia sp. The purified enzyme had a molecular mass of 480 kDa and comprises four identical subunits. The enzyme cleaves bonds in side chains of yeast mannan (Km = 0.08 mM, k(cat) = 1.02 micromol x min(-1) x mg(-1)) and reveals a low activity towards p-nitrophenyl alpha-D-mannopyranoside. The alpha-mannosidase is a Ca2+-dependent enzyme and is inhibited by EDTA. The enzyme possess no endo-mannosidase activity releasing only mannose in the reaction with the inversion of anomeric configuration and could be classified as exo-alpha-mannanase. The enzyme revealed a high deglycosylating activity towards the short mannose-rich O-linked carbohydrate chains of glycoproteins.
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