considerably differing in the GalNAc-ase activity were used for the synthesis of the following structures β- d -Gal p NAc-(1→4)- d -Glc p NAc, β- d -Gal p NAc-(1→6)- d -Glc p NAc, β- d -Gal p NAc-(1→6)- d -Gal p NAc, β- d -Gal p NAc-(1→4)-α- d -Glc p NAcOAll and β- d -Gal p NAc-(1→6)-β- d -Gal p -(1→4)-α- d -Glc p NAcOAll to demonstrate the application of these new enzymes.
摘要测试了约60株真菌菌株的细胞外β-N-乙酰基己糖胺酶的生产。在一些草酸青霉菌株的培养滤液中发现了独特的β-N-乙酰基己糖胺酶,其β-GalNAc-酶/β-GlcNAc-酶之比为2.3-2.8。加入20%(w / v)的MgSO 4使β-GalNAc-酶/β-GlcNAc-酶之比增加到3.35。耕种条件也会影响该比例。用来自草甘膦CCF 2430和米曲霉CCF 1066的GalNAc酶活性明显不同的β-N-乙酰己糖胺酶合成以下结构β-d -Gal p NAc-(1→4)-d -Glc p NAc,β-d -Gal p NAc-(1→6)-d -Glc p NAc,β-d -Gal p NAc-(1→6)-d -Gal p NAc,
Enzymatic Discrimination of 2-Acetamido-2-deoxy-D-mannopyranose-Containing Disaccharides Using β-N-Acetylhexosaminidases
oxalicum, P. funiculosum, P. multicolor, Talaromyces flavus and jack beans hydrolyzed both types of disaccharides. Molecular modelling of β-N-acetylhexosaminidase from A. oryzae CCF 1066 and docking experiments with both types of disaccharides revealed that the ManNAc residue causes distortion of disaccharide molecule resulting in a steric conflict with a Trp482 that causes diminished stabilization of the