6GKI

Structure of E coli MlaC in Variously Loaded States

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.23 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history. 


Literature

Evidence for phospholipid export from the bacterial inner membrane by the Mla ABC transport system.

Hughes, G.W., Hall, S.C.L., Laxton, C.S., Sridhar, P., Mahadi, A.H., Hatton, C., Piggot, T.J., Wotherspoon, P.J., Leney, A.C., Ward, D.G., Jamshad, M., Spana, V., Cadby, I.T., Harding, C., Isom, G.L., Bryant, J.A., Parr, R.J., Yakub, Y., Jeeves, M., Huber, D., Henderson, I.R., Clifton, L.A., Lovering, A.L., Knowles, T.J.

(2019) Nat Microbiol 4: 1692-1705

  • DOI: 10.1038/s41564-019-0481-y
  • Primary Citation of Related Structures:  
    6GKI

  • PubMed Abstract: 

    • The Mla pathway is believed to be involved in maintaining the asymmetrical Gram-negative outer membrane via retrograde phospholipid transport. The pathway is composed of three components: the outer membrane MlaA-OmpC/F complex, a soluble periplasmic protein, MlaC, and the inner membrane ATPase, MlaFEDB complex ...

    The Mla pathway is believed to be involved in maintaining the asymmetrical Gram-negative outer membrane via retrograde phospholipid transport. The pathway is composed of three components: the outer membrane MlaA-OmpC/F complex, a soluble periplasmic protein, MlaC, and the inner membrane ATPase, MlaFEDB complex. Here, we solve the crystal structure of MlaC in its phospholipid-free closed apo conformation, revealing a pivoting β-sheet mechanism that functions to open and close the phospholipid-binding pocket. Using the apo form of MlaC, we provide evidence that the inner-membrane MlaFEDB machinery exports phospholipids to MlaC in the periplasm. Furthermore, we confirm that the phospholipid export process occurs through the MlaD component of the MlaFEDB complex and that this process is independent of ATP. Our data provide evidence of an apparatus for lipid export away from the inner membrane and suggest that the Mla pathway may have a role in anterograde phospholipid transport.

    Organizational Affiliation: 

    School of Biosciences, University of Birmingham, Birmingham, UK. t.j.knowles@bham.ac.uk.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Probable phospholipid-binding protein MlaCA, B198Escherichia coli K-12Mutation(s): 0 
Gene Names: mlaC, yrbC, b3192, JW3159
UniProt
Find proteins for P0ADV7 (Escherichia coli (strain K12))
Explore P0ADV7 
Go to UniProtKB:  P0ADV7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0ADV7
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.23 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 105.29α = 90
b = 105.29β = 90
c = 96.41γ = 120
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report



View more in-depth experimental data
Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Biotechnology and Biological Sciences Research CouncilUnited KingdomBB/P009840/1

Revision History  (Full details and data files)

  • Version 1.0: 2019-04-17
    Type: Initial release
  • Version 1.1: 2019-09-04
    Changes: Data collection, Database references
  • Version 1.2: 2019-10-02
    Changes: Data collection, Database references