Weerapana Eranthie, Glover Kerney Jebrell, Chen Mark M, Imperiali Barbara
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
J Am Chem Soc. 2005 Oct 12;127(40):13766-7. doi: 10.1021/ja054265v.
The chemical synthesis and biological activity of undecaprenyl pyrophosphate bacillosamine (Und-PP-Bac), an obligatory intermediate in the asparagine-linked glycosylation pathway of Campylobacter jejuni, are reported. The key transformation involves the coupling of bacillosamine phosphate and undecaprenyl phosphate. The synthetic Und-PP-Bac can be used to investigate the activity of the enzyme PglA, which catalyzes the first glycosyl transfer in substrate biosynthesis for N-linked protein glycosylation in the pathogenic gram-negative bacterium. The availability of this synthetic substrate makes it possible to access polyprenyl-linked oligosaccharides, such as the GalNAc-alpha-1,3-bacillosamine-alpha-1-PP-Und intermediate, that will enable exploration of the remaining enzymes in the prokaryotic glycosylation pathway. Study of the bacterial glycosylation system will provide insight into the corresponding eukaryotic process, which is currently poorly understood.
报道了空肠弯曲菌天冬酰胺连接糖基化途径中的必需中间体——十一异戊烯基焦磷酸杆菌胺(Und-PP-Bac)的化学合成及生物活性。关键转化步骤涉及磷酸杆菌胺与磷酸十一异戊烯酯的偶联。合成的Und-PP-Bac可用于研究PglA酶的活性,该酶催化致病性革兰氏阴性菌N-连接蛋白糖基化底物生物合成中的首次糖基转移。这种合成底物的可得性使得获取多聚异戊烯基连接的寡糖成为可能,比如GalNAc-α-1,3-杆菌胺-α-1-PP-Und中间体,这将有助于探索原核糖基化途径中的其余酶。对细菌糖基化系统的研究将为目前了解甚少的相应真核过程提供深入见解。