5UWA

Structure of E. coli phospholipid binding protein MlaC

  • Classification: TRANSPORT PROTEIN
  • Organism(s): Escherichia coli K-12
  • 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: 1.50 Å
  • R-Value Free: 0.168 
  • R-Value Work: 0.138 
  • R-Value Observed: 0.139 

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This is version 1.4 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: https://doi.org/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-binding protein MlaC
A, B
203Escherichia coli K-12Mutation(s): 0 
Gene Names: mlaC, yrbC, b3192, JW3159
Membrane Entity: Yes 
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
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
8ND
Query on 8ND
Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]		(2S)-3-(2-aminoethoxy)propane-1,2-diyl dihexadecanoate
C37 H73 N O5
UWTLPHGXKLBELN-DHUJRADRSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.168 
  • R-Value Work: 0.138 
  • R-Value Observed: 0.139 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 33.63α = 90
b = 115.89β = 90
c = 133.22γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


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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: 2017-08-09
    Changes: Database references
  • Version 1.3: 2017-09-27
    Changes: Author supporting evidence
  • Version 1.4: 2019-11-20
    Changes: Author supporting evidence