Structural basis of lipopolysaccharide maturation by the O-antigen ligase.
Structural basis of lipopolysaccharide maturation by the O-antigen ligase.
复制标题
DOI:
10.1038/s41586-022-04555-x
复制
发表时间:
2022-04
期刊:
影响因子:
64.8
通讯作者:
中科院分区:
文献类型:
--
作者:
The outer membrane of Gram-negative bacteria has an external leaflet that is largely composed of lipopolysaccharide, which provides a selective permeation barrier, particularly against antimicrobials. The final and crucial step in the biosynthesis of lipopolysaccharide is the addition of a species-dependent O-antigen to the lipid A core oligosaccharide, which is catalysed by the O-antigen ligase WaaL. Here we present structures of WaaL from Cupriavidus metallidurans, both in the apo state and in complex with its lipid carrier undecaprenyl pyrophosphate, determined by single-particle cryo-electron microscopy. The structures reveal that WaaL comprises 12 transmembrane helices and a predominantly α-helical periplasmic region, which we show contains many of the conserved residues that are required for catalysis. We observe a conserved fold within the GT-C family of glycosyltransferases and hypothesize that they have a common mechanism for shuttling the undecaprenyl-based carrier to and from the active site. The structures, combined with genetic, biochemical, bioinformatics and molecular dynamics simulation experiments, offer molecular details on how the ligands come in apposition, and allows us to propose a mechanistic model for catalysis. Together, our work provides a structural basis for lipopolysaccharide maturation in a member of the GT-C superfamily of glycosyltransferases.
登录
查看更多内容
影响因子:
4.4
作者:
Jiang, Yu;Chen, Biao;Yang, Sheng
通讯作者:
Yang, Sheng
DOI:
10.1107/s0907444904019158
发表时间:
2004-12-01
影响因子:
2.2
作者:
Emsley, P;Cowtan, K
通讯作者:
Cowtan, K
影响因子:
3.2
作者:
HITCHCOCK, PJ;BROWN, TM
通讯作者:
BROWN, TM
DOI:
10.1016/j.str.2015.11.014
发表时间:
2016-02-02
期刊:
Structure (London, England : 1993)
影响因子:
--
作者:
Dominik PK;Borowska MT;Dalmas O;Kim SS;Perozo E;Keenan RJ;Kossiakoff AA
通讯作者:
Kossiakoff AA
DOI:
10.1107/s2059798318006551
发表时间:
2018-06-01
期刊:
Acta crystallographica. Section D, Structural biology
影响因子:
--
作者:
Afonine PV;Poon BK;Read RJ;Sobolev OV;Terwilliger TC;Urzhumtsev A;Adams PD
通讯作者:
Adams PD