Structural basis for lipid and copper regulation of the ABC transporter MsbA.
Structural basis for lipid and copper regulation of the ABC transporter MsbA.
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DOI:
10.1038/s41467-022-34905-2
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发表时间:
2022-11-26
影响因子:
16.6
通讯作者:
Laganowsky, Arthur
中科院分区:
文献类型:
--
作者:
Lyu, Jixing;Liu, Chang;Zhang, Tianqi;Schrecke, Samantha;Elam, Nicklaus P.;Packianathan, Charles;Hochberg, Georg K. A.;Russell, David;Zhao, Minglei;Laganowsky, Arthur
A critical step in lipopolysaccharide (LPS) biogenesis involves flipping lipooligosaccharide, an LPS precursor, from the cytoplasmic to the periplasmic leaflet of the inner membrane, an operation carried out by the ATP-binding cassette transporter MsbA. Although LPS binding to the inner cavity of MsbA is well established, the selectivity of MsbA-lipid interactions at other site(s) remains poorly understood. Here we use native mass spectrometry (MS) to characterize MsbA-lipid interactions and guide structural studies. We show the transporter co-purifies with copper(II) and metal binding modulates protein-lipid interactions. A 2.15 Å resolution structure of an N-terminal region of MsbA in complex with copper(II) is presented, revealing a structure reminiscent of the GHK peptide, a high-affinity copper(II) chelator. Our results demonstrate conformation-dependent lipid binding affinities, particularly for the LPS-precursor, 3-deoxy-D-manno-oct-2-ulosonic acid (Kdo)2-lipid A (KDL). We report a 3.6 Å-resolution structure of MsbA trapped in an open, outward-facing conformation with adenosine 5’-diphosphate and vanadate, revealing a distinct KDL binding site, wherein the lipid forms extensive interactions with the transporter. Additional studies provide evidence that the exterior KDL binding site is conserved and a positive allosteric modulator of ATPase activity, serving as a feedforward activation mechanism to couple transporter activity with LPS biosynthesis. The bacterial ABC transporter MsbA is essential for lipopolysaccharide biogenesis. Here, the authors apply native mass spectrometry, X-ray crystallography, cryo-EM and biochemical approaches to characterize the structural basis and functional roles of MsbA binding to copper and specific lipids.
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影响因子:
14.8
作者:
通讯作者:
--
DOI:
10.1093/bioinformatics/btp163
发表时间:
2009-06-01
期刊:
Bioinformatics (Oxford, England)
影响因子:
--
作者:
Cock PJ;Antao T;Chang JT;Chapman BA;Cox CJ;Dalke A;Friedberg I;Hamelryck T;Kauff F;Wilczynski B;de Hoon MJ
通讯作者:
de Hoon MJ
影响因子:
16.6
作者:
Cong X;Liu Y;Liu W;Liang X;Laganowsky A
通讯作者:
Laganowsky A
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:
15
作者:
Cong, Xiao;Liu, Yang;Laganowsky, Arthur
通讯作者:
Laganowsky, Arthur