The structure of an outer membrance protein from Borrelia burgdorferi B31

Experimental Data Snapshot

  • Resolution: 1.79 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.214 

wwPDB Validation   3D Report Full Report

This is version 1.4 of the entry. See complete history


Insights into PG-binding, conformational change, and dimerization of the OmpA C-terminal domains from Salmonella enterica serovar Typhimurium and Borrelia burgdorferi.

Tan, K.Deatherage Kaiser, B.L.Wu, R.Cuff, M.Fan, Y.Bigelow, L.Jedrzejczak, R.P.Adkins, J.N.Cort, J.R.Babnigg, G.Joachimiak, A.

(2017) Protein Sci 26: 1738-1748

  • DOI: https://doi.org/10.1002/pro.3209
  • Primary Citation of Related Structures:  
    3OON, 4RHA, 5VES

  • PubMed Abstract: 

    Salmonella enterica serovar Typhimurium can induce both humoral and cell-mediated responses when establishing itself in the host. These responses are primarily stimulated against the lipopolysaccharide and major outer membrane (OM) proteins. OmpA is one of these major OM proteins. It comprises a N-terminal eight-stranded β-barrel transmembrane domain and a C-terminal domain (OmpA CTD ). The OmpA CTD and its homologs are believed to bind to peptidoglycan (PG) within the periplasm, maintaining bacterial osmotic homeostasis and modulating the permeability and integrity of the OM. Here we present the first crystal structures of the OmpA CTD from two pathogens: S. typhimurium (STOmpA CTD ) in open and closed forms and causative agent of Lyme Disease Borrelia burgdorferi (BbOmpA CTD ), in closed form. In the open form of STOmpA CTD , an aspartate residue from a long β2-α3 loop points into the binding pocket, suggesting that an anion group such as a carboxylate group from PG is favored at the binding site. In the closed form of STOmpA CTD and in the structure of BbOmpA CTD , a sulfate group from the crystallization buffer is tightly bound at the binding site. The differences between the closed and open forms of STOmpA CTD , suggest a large conformational change that includes an extension of α3 helix by ordering a part of β2-α3 loop. We propose that the sulfate anion observed in these structures mimics the carboxylate group of PG when bound to STOmpA CTD suggesting PG-anchoring mechanism. In addition, the binding of PG or a ligand mimic may enhance dimerization of STOmpA CTD , or possibly that of full length STOmpA.

  • Organizational Affiliation

    Center for Structural Genomics of Infectious Diseases, University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois, 60637.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Outer membrane protein (Tpn50)123Borreliella burgdorferi B31Mutation(s): 0 
Gene Names: BB_0167
Find proteins for O51189 (Borreliella burgdorferi (strain ATCC 35210 / DSM 4680 / CIP 102532 / B31))
Explore O51189 
Go to UniProtKB:  O51189
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO51189
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on SO4

Download Ideal Coordinates CCD File 
O4 S
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
Experimental Data & Validation

Experimental Data

  • Resolution: 1.79 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.214 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 52.089α = 90
b = 74.784β = 90
c = 66.76γ = 90
Software Package:
Software NamePurpose
SBC-Collectdata collection
ARPmodel building
WARPmodel building
HKL-3000data reduction
HKL-3000data scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-09-22
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2015-04-08
    Changes: Structure summary
  • Version 1.3: 2017-11-08
    Changes: Refinement description
  • Version 1.4: 2019-12-04
    Changes: Database references, Derived calculations