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- PDB-8dmo: Structure of open, inward-facing MsbA from E. coli -

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Basic information

Entry
Database: PDB / ID: 8dmo
TitleStructure of open, inward-facing MsbA from E. coli
ComponentsATP-binding transport protein MsbA
KeywordsTRANSPORT PROTEIN / ABC transporter
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 / plasma 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
ATP-binding transport protein MsbA
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.9 Å
AuthorsLiu, C. / Lyu, J. / Laganowsky, A.D. / Zhao, M.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM143052 United States
CitationJournal: 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.
History
DepositionJul 8, 2022Deposition site: RCSB / Processing site: RCSB
Revision 1.0Dec 14, 2022Provider: repository / Type: Initial release
Revision 1.1Jun 12, 2024Group: Data collection / Category: chem_comp_atom / chem_comp_bond

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: ATP-binding transport protein MsbA
B: ATP-binding transport protein MsbA


Theoretical massNumber of molelcules
Total (without water)129,0872
Polymers129,0872
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: mass spectrometry, native mass spectrometry
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein ATP-binding transport protein MsbA / ATP-binding transport protein multicopy suppressor of htrB / Lipid A ABC exporter / fused ATPase ...ATP-binding transport protein multicopy suppressor of htrB / Lipid A ABC exporter / fused ATPase and inner membrane subunits MsbA / Lipid A ABC transporter ATP-binding protein/permease MsbA / Lipid A export ATP-binding/permease MsbA / Lipid A export permease MsbA / Lipid ABC transporter permease/ATP-binding protein / Lipid ABC transporter permease/ATPase / Lipid transporter ATP-binding/permease / Vga(B)_1_U82085


Mass: 64543.473 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Production host: Escherichia coli (E. coli)
References: UniProt: C3TGA2, Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to catalyse transmembrane movement of substances

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Copper-bound MsbA / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Escherichia coli (E. coli)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.4
SpecimenConc.: 8 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 281 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2500 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.19.2_4158: / Classification: refinement
EM software
IDNameCategory
4cryoSPARCCTF correction
11cryoSPARCfinal Euler assignment
13cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING ONLY
SymmetryPoint symmetry: C2 (2 fold cyclic)
3D reconstructionResolution: 3.9 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 421840 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0039044
ELECTRON MICROSCOPYf_angle_d0.60812223
ELECTRON MICROSCOPYf_dihedral_angle_d3.9811249
ELECTRON MICROSCOPYf_chiral_restr0.0421454
ELECTRON MICROSCOPYf_plane_restr0.0041547

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