6V0C

Lipophilic Envelope-spanning Tunnel B (LetB), Model 1


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.46 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 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: 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 ...

    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. Electronic address: gira.bhabha@gmail.com.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Intermembrane transport protein YebT
A, B, C, D, E, F
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
Protein Feature View
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.46 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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