Characterization of<i>Helicobacter pylori</i>α1,2-Fucosyltransferase for Enzymatic Synthesis of Tumor-Associated Antigens
作者:Daniel B. Stein、Yu-Nong Lin、Chun-Hung Lin
DOI:10.1002/adsc.200800435
日期:2008.10.6
Helicobacter pylori catalyzes the fucosylation of acceptor oligosaccharides at the C2-OH of terminal Galβ units. The enzyme from strain NCTC11639 was evaluated for its ability to synthesize cancer-associated antigens. The α1,2-FucT was determined to be active over a pH range between 4.0 and 8.0 with the optimum occurring at pH 5.0. Although a divalent metal ion cofactor was not required for catalysis, enhancement
来自幽门螺杆菌的α1,2-岩藻糖基转移酶(α1,2-FucT)催化末端Galβ单元的C2-OH上受体寡糖的岩藻糖基化。评价了来自菌株NCTC11639的酶合成癌症相关抗原的能力。经测定,α1,2-FucT在4.0至8.0的pH范围内具有活性,最适在pH 5.0时发生。尽管催化不需要二价金属离子辅助因子,但在添加Mn 2+后可检测到酶活性的增强。。详细的底物特异性分析表明,α1,2-FucT可以催化多种寡糖底物的岩藻糖基化。与包含2型结构(Galβ1-4GlcNAc)的聚糖相比,优选地,所述α1,2-FucT包含岩藻糖基化的1型结构(Galβ1-3GlcNAc)的聚糖。发现路易斯A三糖[Galβ1-3(Fucα1-4)GlcNAc]是最好的受体。唯一的例外是Lewis x五糖LNFP III [Galβ1-4(Fucα1-3)GlcNAcβ1-3Galβ1-4Glc]优于Lewis a类似物LNFP