Crystal Structures of MOMP from Campylobacter jejuni

Experimental Data Snapshot

  • Resolution: 2.88 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.239 

Starting Model: experimental
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MOMP from Campylobacter jejuni Is a Trimer of 18-Stranded beta-Barrel Monomers with a Ca(2+) Ion Bound at the Constriction Zone.

Ferrara, L.G.Wallat, G.D.Moynie, L.Dhanasekar, N.N.Aliouane, S.Acosta-Gutierrez, S.Pages, J.M.Bolla, J.M.Winterhalter, M.Ceccarelli, M.Naismith, J.H.

(2016) J Mol Biol 428: 4528-4543

  • DOI: https://doi.org/10.1016/j.jmb.2016.09.021
  • Primary Citation of Related Structures:  
    5LDT, 5LDV

  • PubMed Abstract: 

    The Gram-negative organism Campylobacter jejuni is the major cause of food poisoning. Unlike Escherichia coli, which has two major porins, OmpC and OmpF, C. jejuni has one, termed major outer membrane protein (MOMP) through which nutrients and antibiotics transit. We report the 2.1-Å crystal structure of C. jejuni MOMP expressed in E. coli and a lower resolution but otherwise identical structure purified directly from C. jejuni. The 2.1-Å resolution structure of recombinant MOMP showed that although the protein has timeric arrangement similar to OmpC, it is an 18-stranded, not 16-stranded, β-barrel. The structure has identified a Ca 2+ bound at the constriction zone, which is functionally significant as suggested by molecular dynamics and single-channel experiments. The water-filled channel of MOMP has a narrow constriction zone, and single-molecule studies show a monomeric conductivity of 0.7±0.2 nS and a trimeric conductance of 2.2±0.2 nS. The ion neutralizes negative charges at the constriction zone, reducing the transverse electric field and reversing ion selectivity. Modeling of the transit of ciprofloxacin, an antibiotic of choice for treating Campylobacter infection, through the pore of MOMP reveals a trajectory that is dependent upon the presence metal ion.

  • Organizational Affiliation

    Biomedical Sciences Research Complex, University of St Andrews, 09042 St Andrews, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
MOMP porin
A, B, C
405Campylobacter jejuniMutation(s): 0 
Membrane Entity: Yes 
Find proteins for Q659I5 (Campylobacter jejuni)
Explore Q659I5 
Go to UniProtKB:  Q659I5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ659I5
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on C8E

Download Ideal Coordinates CCD File 
F [auth A],
J [auth B],
L [auth C]
C16 H34 O5
Query on CA

Download Ideal Coordinates CCD File 
D [auth A]
E [auth A]
G [auth A]
H [auth B]
I [auth B]
D [auth A],
E [auth A],
G [auth A],
H [auth B],
I [auth B],
K [auth C]
Experimental Data & Validation

Experimental Data

  • Resolution: 2.88 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.239 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 94.36α = 90
b = 99.33β = 90
c = 172.14γ = 90
Software Package:
Software NamePurpose
xia2data reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
United Kingdom--

Revision History  (Full details and data files)

  • Version 1.0: 2016-10-26
    Type: Initial release
  • Version 1.1: 2016-11-09
    Changes: Database references
  • Version 1.2: 2024-01-10
    Changes: Data collection, Database references, Derived calculations, Refinement description