Phosphomannose isomerase/GDP-mannose pyrophosphorylase from Pyrococcus furiosus: a thermostable biocatalyst for the synthesis of guanidinediphosphate-activated and mannose-containing sugar nucleotides
作者:Rahman M. Mizanur、Nicola L. B. Pohl
DOI:10.1039/b822794b
日期:——
Herein we present an analysis of the chemical function of a recombinant bifunctional phosphomannose isomerase/GDP-mannose pyrophosphorylase (manC) from Pyrococcus furiosusDSM 3638 and its use in the synthesis of guanidinediphospho-hexoses and a range of nucleotidediphospho-mannoses. This enzyme is unusually promiscuous in both its nucleotide triphosphate (NTP) and sugar-1-phosphate acceptance. It accepts all five naturally occurring NTPs (ATP, CTP, GTP, dTTP and UTP) and a range of sugar-1-phosphates (glucose-, mannose-, galactose-, glucosamine-, N-acetylglucosamine- and fucose-1-phosphate). A truncated GDP-mannose pyrophosphorylase domain of the whole length enzyme showed almost 100-fold less sugar nucleotidyltransferase activity with only GTP and mannose 1-phosphate as substrates. The temperature stability and inherently broad substrate tolerance of this archaeal enzyme make it an effective reagent for the rapid chemoenzymatic synthesis of a range of natural and unnatural sugar nucleotides that are challenging to make by chemical means alone.
在本文中,我们分析了来自 Pyrococcus furiosusDSM 3638 的重组双功能磷甘露糖异构酶/GDP-甘露糖焦磷酸化酶(manC)的化学功能,以及它在合成鸟苷酸二磷六糖和一系列核苷酸二磷甘露糖中的应用。这种酶在接受核苷酸三磷酸(NTP)和糖-1-磷酸方面都异常杂乱。它能接受所有五种天然存在的 NTP(ATP、CTP、GTP、dTTP 和 UTP)和一系列糖-1-磷酸(葡萄糖、甘露糖、半乳糖、葡萄糖胺、N-乙酰葡萄糖胺和岩藻糖-1-磷酸)。全长酶的截短 GDP-甘露糖焦磷酸化酶结构域在仅以 GTP 和 1-磷酸甘露糖为底物的情况下,糖核苷酸转移酶活性几乎降低了 100 倍。这种古菌酶的温度稳定性和固有的广泛底物耐受性使其成为一种有效的试剂,可用于快速化学合成一系列天然和非天然糖核苷酸,而这些糖核苷酸很难通过化学方法单独制造。