- EMDB-27545: Structure of open, inward-facing MsbA from E. coli -
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Basic information
Entry
Database: EMDB / ID: EMD-27545
Title
Structure of open, inward-facing MsbA from E. coli
Map data
Sample
Complex: Copper-bound MsbA
Protein or peptide: ATP-binding transport protein MsbA
Keywords
ABC transporter / TRANSPORT PROTEIN
Function / homology
Function and homology information
Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to catalyse transmembrane movement of substances / ATPase-coupled lipid transmembrane transporter activity / ABC-type transporter activity / ATP hydrolysis activity / ATP binding / membrane Similarity search - Function
ABC transporter, lipid A-core flippase, MsbA / Type 1 protein exporter / ABC transporter transmembrane region / ABC transporter type 1, transmembrane domain / ABC transporter integral membrane type-1 fused domain profile. / ABC transporter type 1, transmembrane domain superfamily / ABC transporter-like, conserved site / ABC transporters family signature. / ABC transporter / ABC transporter-like, ATP-binding domain ...ABC transporter, lipid A-core flippase, MsbA / Type 1 protein exporter / ABC transporter transmembrane region / ABC transporter type 1, transmembrane domain / ABC transporter integral membrane type-1 fused domain profile. / ABC transporter type 1, transmembrane domain superfamily / ABC transporter-like, conserved site / ABC transporters family signature. / ABC transporter / ABC transporter-like, ATP-binding domain / ATP-binding cassette, ABC transporter-type domain profile. / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase Similarity search - Domain/homology
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM143052
United States
Citation
Journal: Nat Commun / Year: 2022 Title: Structural basis for lipid and copper regulation of the ABC transporter MsbA. Authors: Jixing Lyu / Chang Liu / Tianqi Zhang / Samantha Schrecke / Nicklaus P Elam / Charles Packianathan / Georg K A Hochberg / David Russell / Minglei Zhao / Arthur Laganowsky / Abstract: 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 ...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)-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.
Macromolecule #1: ATP-binding transport protein MsbA
Macromolecule
Name: ATP-binding transport protein MsbA / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO EC number: Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to catalyse transmembrane movement of substances
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