title: Fungal beta-N-acetylhexosaminidases with high beta-N-acetylgalactosaminidase activity and their use for synthesis of beta-GalNAc-containing oligosaccharides.
abstract: About 60 fungal strains were tested for production of extracellular beta-N-acetylhexosaminidases. A unique beta-N-acetylhexosaminidase with the beta-GalNAc-ase/beta-GlcNAc-ase ratio of 2.3-2.8 was found in the culture filtrates of some strains of Penicillium oxalicum. Addition of 20% (w/v) MgSO(4) increased the beta-GalNAc-ase/beta-GlcNAc-ase ratio to the value of 3.35. Cultivation conditions influence this ratio as well. beta-N-Acetylhexosaminidases from P. oxalicum CCF 2430 and Aspergillus oryzae CCF 1066 considerably differing in the GalNAc-ase activity were used for the synthesis of the following structures beta-D-GalpNAc-(1-->4)-D-GlcpNAc, beta-D-GalpNAc-(1-->6)-D-GlcpNAc, beta-D-GalpNAc-(1-->6)-D-GalpNAc, beta-D-GalpNAc-(1-->4)-alpha-D-GlcpNAcOAll and beta-D-GalpNAc-(1-->6)-beta-D-Galp-(1-->4)-alpha-D-GlcpNAcOAll to demonstrate the application of these new enzymes.
authors.affiliation: Laboratory of Biotransformation, Institute of Microbiology, Academy of Sciences of the Czech Republic, Vídenská 1083, Prague 4, CZ 142 20, Czech Republic.
authors.forename: Lenka
authors.initials: L
authors.lastname: Weignerová
authors.forename: Petra
authors.initials: P
authors.lastname: Vavrusková
authors.forename: Andrea
authors.initials: A
authors.lastname: Pisvejcová
authors.forename: Joachim
authors.initials: J
authors.lastname: Thiem
authors.forename: Vladimír
authors.initials: V
authors.lastname: Kren
mesh_terms: D006596:Hexosaminidases / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D015394:Molecular Structure; D009844:Oligosaccharides / Q000138:chemical synthesis* / Q000737:chemistry*; D010407:Penicillium / Q000201:enzymology*; D013379:Substrate Specificity; D048828:beta-N-Acetyl-Galactosaminidase; D001619:beta-N-Acetylhexosaminidases / Q000378:metabolism*
chemical_list: D009844:Oligosaccharides; D006596:Hexosaminidases; D001619:beta-N-Acetylhexosaminidases; D048828:beta-N-Acetyl-Galactosaminidase