Facile Formation of β‐thioGlcNAc Linkages to Thiol‐Containing Sugars, Peptides, and Proteins using a Mutant GH20 Hexosaminidase
作者:Gregor Tegl、John Hanson、Hong‐Ming Chen、David H Kwan、Andrés G. Santana、Stephen G. Withers
DOI:10.1002/anie.201809928
日期:2019.2.4
including S-GlcNAcylated proteins, is reported, using a thioglycoligase derived from a GH20 hexosaminidase from Streptomyces plicatus in which the catalytic acid/base glutamate has been mutated to an alanine (SpHex E314A). This robust, easily-prepared, engineered enzyme uses GlcNAc and GalNAc donors and couples them to a remarkably diverse set of thiol acceptors. Thioglycoligation using 3-, 4-, and 6-thiosugar
硫代糖苷是O-连接糖苷的耐水解酶模拟物,可作为研究糖苷在生物过程中作用的有价值的探针。据报道,使用衍生自褶皱链霉菌的GH20己糖胺酶的巯基糖苷酶(其中催化酸/谷氨酸催化位点已突变为丙氨酸),开发了一种有效的酶介导的巯基糖苷酶(包括S-GlcNAcylated蛋白)的合成方法。 )。这种健壮,易于制备的工程化酶使用GlcNAc和GalNAc供体,并将它们与多种多样的硫醇受体结合。使用来自各种糖家族的3-,4-和6-硫代糖受体的硫糖基化作用以接近定量的产量产生S-连接的二糖。这套可能的硫醇受体还包括含半胱氨酸的肽和蛋白质,