Sugar nucleotide recognition by Klebsiella pneumoniae UDP-d-galactopyranose mutase: Fluorinated substrates, kinetics and equilibria
作者:James C. Errey、Maretta C. Mann、Shirley A. Fairhurst、Lionel Hill、Michael R. McNeil、James H. Naismith、Jonathan M. Percy、Chris Whitfield、Robert A. Field
DOI:10.1039/b815549f
日期:——
have been evaluated as substrates for Klebsiella pneumoniaeUDP-D-galactopyranose mutase. This enzyme, which catalyses the interconversion of the pyranose and furanose forms of galactose as its UDP adduct, is a prospective drug target for a variety of microbial infections. We show that none of the 2″-, 3″- or 6″-hydroxyl groups of UDP-D-galactopyranose are essential for substrate binding and turnover
一系列选择性氟化和其他取代的 UDP- D-半乳糖衍生物已被评估为肺炎克雷伯氏菌UDP- D-吡喃半乳糖变位酶的底物。这种酶催化吡喃糖和呋喃糖形式的相互转化半乳糖作为其 UDP 加合物,是多种微生物感染的潜在药物靶点。我们表明,UDP- D-吡喃半乳糖的 2”-、3”-或 6”-羟基对底物结合和周转都不是必需的。然而,空间因子似乎在限制糖核苷酸底物的 C-2" 和 C-6" 处可容纳的取代范围方面发挥重要作用。尝试将 C-2" 立体化学从赤道反转为轴向,将D-半乳糖- 变为D-塔洛-构型,以尝试利用塔洛系列中平衡时较高百分比的呋喃糖,但没有底物周转.