6O30

Lipid A transporter MsbA from Salmonella typhimurium


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.47 Å
  • R-Value Free: 0.340 
  • R-Value Work: 0.307 
  • R-Value Observed: 0.308 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structural Insights into the Lipid A Transport Pathway in MsbA.

Padayatti, P.S.Lee, S.C.Stanfield, R.L.Wen, P.C.Tajkhorshid, E.Wilson, I.A.Zhang, Q.

(2019) Structure 27: 1114-1123.e3

  • DOI: 10.1016/j.str.2019.04.007
  • Primary Citation of Related Structures:  
    6BL6, 6O30

  • PubMed Abstract: 
  • MsbA is an essential ATP-binding cassette transporter in Gram-negative bacteria that transports lipid A and lipopolysaccharide from the cytoplasmic leaflet to the periplasmic leaflet of the inner membrane. Here we report the X-ray structure of MsbA from Salmonella typhimurium at 2 ...

    MsbA is an essential ATP-binding cassette transporter in Gram-negative bacteria that transports lipid A and lipopolysaccharide from the cytoplasmic leaflet to the periplasmic leaflet of the inner membrane. Here we report the X-ray structure of MsbA from Salmonella typhimurium at 2.8-Å resolution in an inward-facing conformation after cocrystallization with lipid A and using a stabilizing facial amphiphile. The structure displays a large amplitude opening in the transmembrane portal, which is likely required for lipid A to pass from its site of synthesis into the protein-enclosed transport pathway. Putative lipid A density is observed further inside the transmembrane cavity, consistent with a trap and flip model. Additional electron density attributed to lipid A is observed near an outer surface cleft at the periplasmic ends of the transmembrane helices. These findings provide new structural insights into the lipid A transport pathway through comparative analysis with existing MsbA structures.


    Organizational Affiliation

    Department of Integrative Structural and Computational Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA. Electronic address: qinghai@scripps.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Lipid A export ATP-binding/permease protein MsbAA, B576Salmonella enterica subsp. enterica serovar TyphimuriumMutation(s): 0 
Gene Names: msbADD95_15660EIL76_15590
EC: 7.5.2.6
Membrane Entity: Yes 
UniProt
Find proteins for P63359 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P63359 
Go to UniProtKB:  P63359
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP63359
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.47 Å
  • R-Value Free: 0.340 
  • R-Value Work: 0.307 
  • R-Value Observed: 0.308 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.257α = 90
b = 153.2β = 90
c = 232.483γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
SCALEPACKdata scaling
PHASERphasing

Structure Validation

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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 StatesR01 GM09853
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01 GM118594

Revision History  (Full details and data files)

  • Version 1.0: 2019-06-12
    Type: Initial release
  • Version 1.1: 2019-07-17
    Changes: Data collection, Database references
  • Version 1.2: 2020-01-01
    Changes: Author supporting evidence
  • Version 1.3: 2020-03-04
    Changes: Data collection