6MJP

LptB(E163Q)FGC from Vibrio cholerae


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.85 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.242 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural basis of unidirectional export of lipopolysaccharide to the cell surface.

Owens, T.W.Taylor, R.J.Pahil, K.S.Bertani, B.R.Ruiz, N.Kruse, A.C.Kahne, D.

(2019) Nature 567: 550-553

  • DOI: 10.1038/s41586-019-1039-0
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Gram-negative bacteria are surrounded by an inner cytoplasmic membrane and by an outer membrane, which serves as a protective barrier to limit entry of many antibiotics. The distinctive properties of the outer membrane are due to the presence of lipo ...

    Gram-negative bacteria are surrounded by an inner cytoplasmic membrane and by an outer membrane, which serves as a protective barrier to limit entry of many antibiotics. The distinctive properties of the outer membrane are due to the presence of lipopolysaccharide 1 . This large glycolipid, which contains numerous sugars, is made in the cytoplasm; a complex of proteins forms a membrane-to-membrane bridge that mediates transport of lipopolysaccharide from the inner membrane to the cell surface 1 . The inner-membrane components of the protein bridge comprise an ATP-binding cassette transporter that powers transport, but how this transporter ensures unidirectional lipopolysaccharide movement across the bridge to the outer membrane is unknown 2 . Here we describe two crystal structures of a five-component inner-membrane complex that contains all the proteins required to extract lipopolysaccharide from the membrane and pass it to the protein bridge. Analysis of these structures, combined with biochemical and genetic experiments, identifies the path of lipopolysaccharide entry into the cavity of the transporter and up to the bridge. We also identify a protein gate that must open to allow movement of substrate from the cavity onto the bridge. Lipopolysaccharide entry into the cavity is ATP-independent, but ATP is required for lipopolysaccharide movement past the gate and onto the bridge. Our findings explain how the inner-membrane transport complex controls efficient unidirectional transport of lipopolysaccharide against its concentration gradient.


    Organizational Affiliation

    Department of Microbiology, The Ohio State University, Columbus, OH, USA.,Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA, USA. kahne@chemistry.harvard.edu.,Department of Microbiology, The Ohio State University, Columbus, OH, USA. ruiz.82@osu.edu.,Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, USA.,Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, USA. kahne@chemistry.harvard.edu.,Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA, USA. andrew_kruse@hms.harvard.edu.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ABC transporter ATP-binding protein
A, B
241Vibrio choleraeMutation(s): 1 
Gene Names: lptB
EC: 3.6.3.-
Membrane protein
mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
ATP Binding Cassette (ABC) Transporters
Protein: 
Lipopolysaccharide transporter complex LptB2FGC
Find proteins for O30650 (Vibrio cholerae)
Go to UniProtKB:  O30650
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Lipopolysaccharide export system protein LptC
C
191Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961)Mutation(s): 0 
Gene Names: lptC
Membrane protein
mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
ATP Binding Cassette (ABC) Transporters
Protein: 
Lipopolysaccharide transporter complex LptB2FGC
Find proteins for Q9KP51 (Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961))
Go to UniProtKB:  Q9KP51
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
FIG000988: Predicted permease
F
366Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961)Mutation(s): 0 
Membrane protein
mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
ATP Binding Cassette (ABC) Transporters
Protein: 
Lipopolysaccharide transporter complex LptB2FGC
Find proteins for Q9KP75 (Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961))
Go to UniProtKB:  Q9KP75
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
LPS export ABC transporter permease LptG
G
356Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961)Mutation(s): 0 
Membrane protein
mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
ATP Binding Cassette (ABC) Transporters
Protein: 
Lipopolysaccharide transporter complex LptB2FGC
Find proteins for Q9KP76 (Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961))
Go to UniProtKB:  Q9KP76
Small Molecules
Ligands 9 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
JU7
Query on JU7

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F
6-cyclohexylhexyl beta-D-glucopyranoside
C18 H34 O6
IKXDBGTYPHAFNV-UYTYNIKBSA-N
 Ligand Interaction
CL
Query on CL

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A, B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
GOL
Query on GOL

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B, G
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

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A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
PG4
Query on PG4

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A, B
TETRAETHYLENE GLYCOL
C8 H18 O5
UWHCKJMYHZGTIT-UHFFFAOYSA-N
 Ligand Interaction
MA4
Query on MA4

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G
CYCLOHEXYL-HEXYL-BETA-D-MALTOSIDE
C24 H44 O11
WUCWJXGMSXTDAV-QKMCSOCLSA-N
 Ligand Interaction
AE3
Query on AE3

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A
2-(2-ETHOXYETHOXY)ETHANOL
C6 H14 O3
XXJWXESWEXIICW-UHFFFAOYSA-N
 Ligand Interaction
LMT
Query on LMT

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F, G
DODECYL-BETA-D-MALTOSIDE
C24 H46 O11
NLEBIOOXCVAHBD-QKMCSOCLSA-N
 Ligand Interaction
PEG
Query on PEG

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B
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.85 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.242 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 167.354α = 90.00
b = 80.729β = 112.18
c = 202.992γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling
PHENIXrefinement
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited StatesR01 GM066174
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited StatesR01 AI081059

Revision History 

  • Version 1.0: 2019-03-27
    Type: Initial release
  • Version 1.1: 2019-04-03
    Type: Data collection, Database references
  • Version 1.2: 2019-04-10
    Type: Data collection, Database references