6V0I

Lipophilic Envelope-spanning Tunnel B (LetB), Model 7


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.43 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

LetB Structure Reveals a Tunnel for Lipid Transport across the Bacterial Envelope.

Isom, G.L.Coudray, N.MacRae, M.R.McManus, C.T.Ekiert, D.C.Bhabha, G.

(2020) Cell 181: 653-664.e19

  • DOI: https://doi.org/10.1016/j.cell.2020.03.030
  • Primary Citation of Related Structures:  
    6V0C, 6V0D, 6V0E, 6V0F, 6V0G, 6V0H, 6V0I, 6V0J, 6VCI

  • PubMed Abstract: 

    Gram-negative bacteria are surrounded by an outer membrane composed of phospholipids and lipopolysaccharide, which acts as a barrier and contributes to antibiotic resistance. The systems that mediate phospholipid trafficking across the periplasm, such as MCE (Mammalian Cell Entry) transporters, have not been well characterized. Our ~3.5 Å cryo-EM structure of the E. coli MCE protein LetB reveals an ~0.6 megadalton complex that consists of seven stacked rings, with a central hydrophobic tunnel sufficiently long to span the periplasm. Lipids bind inside the tunnel, suggesting that it functions as a pathway for lipid transport. Cryo-EM structures in the open and closed states reveal a dynamic tunnel lining, with implications for gating or substrate translocation. Our results support a model in which LetB establishes a physical link between the two membranes and creates a hydrophobic pathway for the translocation of lipids across the periplasm.


  • Organizational Affiliation

    Department of Cell Biology, Skirball Institute of Biomolecular Medicine, New York University School of Medicine, New York, NY 10016, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Intermembrane transport protein YebT
A, B, C, D, E
A, B, C, D, E, F
832Escherichia coli K-12Mutation(s): 0 
Gene Names: yebTb1834JW1823
Membrane Entity: Yes 
UniProt
Find proteins for P76272 (Escherichia coli (strain K12))
Explore P76272 
Go to UniProtKB:  P76272
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP76272
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.43 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTPHENIX
RECONSTRUCTIONRELION2.1

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR00GM112982
Other privateUnited StatesDFS-20-16
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR35GM128777-01
National Institutes of Health/National Cancer Institute (NIH/NCI)United StatesACB-12002
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesAGM-12006

Revision History  (Full details and data files)

  • Version 1.0: 2020-05-06
    Type: Initial release
  • Version 1.1: 2020-11-25
    Changes: Database references
  • Version 1.2: 2024-03-06
    Changes: Data collection, Database references, Refinement description