5UW2

Structure of E. coli MCE protein MlaD, periplasmic domain

  • Classification: TRANSPORT PROTEIN
  • Organism(s): Escherichia coli O157:H7
  • Expression System: Escherichia coli
  • Mutation(s): No 
  • Membrane Protein: Yes  mpstruc

  • Deposited: 2017-02-20 Released: 2017-04-12 
  • Deposition Author(s): Bhabha, G., Ekiert, D.C.
  • Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS), Damon Runyon Cancer Research Foundation, Howard Hughes Medical Institute (HHMI)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.85 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.241 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Architectures of Lipid Transport Systems for the Bacterial Outer Membrane.

Ekiert, D.C.Bhabha, G.Isom, G.L.Greenan, G.Ovchinnikov, S.Henderson, I.R.Cox, J.S.Vale, R.D.

(2017) Cell 169: 273-285.e17

  • DOI: 10.1016/j.cell.2017.03.019
  • Primary Citation of Related Structures:  
    5UVN, 5UW2, 5UW8, 5UWA, 5UWB

  • PubMed Abstract: 
  • How phospholipids are trafficked between the bacterial inner and outer membranes through the hydrophilic space of the periplasm is not known. We report that members of the mammalian cell entry (MCE) protein family form hexameric assemblies with a central channel capable of mediating lipid transport ...

    How phospholipids are trafficked between the bacterial inner and outer membranes through the hydrophilic space of the periplasm is not known. We report that members of the mammalian cell entry (MCE) protein family form hexameric assemblies with a central channel capable of mediating lipid transport. The E. coli MCE protein, MlaD, forms a ring associated with an ABC transporter complex in the inner membrane. A soluble lipid-binding protein, MlaC, ferries lipids between MlaD and an outer membrane protein complex. In contrast, EM structures of two other E. coli MCE proteins show that YebT forms an elongated tube consisting of seven stacked MCE rings, and PqiB adopts a syringe-like architecture. Both YebT and PqiB create channels of sufficient length to span the periplasmic space. This work reveals diverse architectures of highly conserved protein-based channels implicated in the transport of lipids between the membranes of bacteria and some eukaryotic organelles.


    Organizational Affiliation

    Department of Cellular and Molecular Pharmacology and the Howard Hughes Medical Institute, The University of California, San Francisco, 600 16(th) Street, San Francisco, CA 94158, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Probable phospholipid ABC transporter-binding protein MlaDA, B, C165Escherichia coli O157:H7Mutation(s): 0 
Gene Names: mlaDZ4556ECs4072
Membrane Entity: Yes 
UniProt
Find proteins for P64605 (Escherichia coli O157:H7)
Explore P64605 
Go to UniProtKB:  P64605
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP64605
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.85 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.241 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 122.36α = 90
b = 63.82β = 130.01
c = 91.15γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing

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 StatesK99GM112982
Damon Runyon Cancer Research FoundationUnited StatesDRG-2140-12
Howard Hughes Medical Institute (HHMI)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2017-04-12
    Type: Initial release
  • Version 1.1: 2017-04-19
    Changes: Database references
  • Version 1.2: 2017-09-27
    Changes: Author supporting evidence
  • Version 1.3: 2019-11-20
    Changes: Author supporting evidence