Enzymatic Discrimination of 2-Acetamido-2-deoxy-D-mannopyranose-Containing Disaccharides Using β-N-Acetylhexosaminidases
作者:Lucie Hušáková、Eva Herkommerová-Rajnochová、Tomáš Semeňuk、Marek Kuzma、Jana Rauvolfová、Věra Přikrylová、Rüdiger Ettrich、Ondřej Plíhal、Karel Bezouška、Vladimír Křen
DOI:10.1002/adsc.200303002
日期:2003.6
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
摘要:米曲霉中的β- N-乙酰己糖胺酶选择性地区分了二糖GlcNAcβ(14)GlcNAc(1)和GlcNAcβ(14)ManNAc(2)的混合物。N,N'-二乙酰基壳二糖(1)被β- N-乙酰基己糖胺酶选择性水解,而其C-2差向异构体(2)则完全抵抗酶水解。用GalNAcβ(14)GlcNAc(3)和GalNAcβ(14)ManNAc(4)也观察到类似的区分。土曲霉,黄曲霉的β- N-乙酰己糖胺酶,牛肾和牛附睾显示出相同的选择性,而来自大豆酱油杆菌,番茄酱油杆菌,巴西青霉,草酸假单胞菌,P。funiculosum,多色的P.,Talaromyces flavus和杰克豆的酶水解了两种类型的双糖。米曲霉CCF 1066的β- N-乙酰基己糖胺酶的分子模型以及两种类型的双糖的对接实验表明,ManNAc残基导致双糖分子变形,从而导致与Trp 482发生空间冲突,从而导致恶唑啉鎓过渡态的稳定性降低通过扩展活动站点中Asp