Crystal Structure of Beta-barrel-like, Uncharacterized Protein of COG5400 from Brucella abortus

Experimental Data Snapshot

  • Resolution: 1.73 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.179 

wwPDB Validation   3D Report Full Report

This is version 1.6 of the entry. See complete history


Periplasmic protein EipA determines envelope stress resistance and virulence in Brucella abortus.

Herrou, J.Willett, J.W.Fiebig, A.Varesio, L.M.Czyz, D.M.Cheng, J.X.Ultee, E.Briegel, A.Bigelow, L.Babnigg, G.Kim, Y.Crosson, S.

(2018) Mol Microbiol 

  • DOI: https://doi.org/10.1111/mmi.14178
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Molecular components of the Brucella abortus cell envelope play a major role in its ability to infect, colonize and survive inside mammalian host cells. In this study, we have defined a role for a conserved gene of unknown function in B. abortus envelope stress resistance and infection. Expression of this gene, which we name eipA, is directly activated by the essential cell cycle regulator, CtrA. eipA encodes a soluble periplasmic protein that adopts an unusual eight-stranded β-barrel fold. Deletion of eipA attenuates replication and survival in macrophage and mouse infection models, and results in sensitivity to treatments that compromise the cell envelope integrity. Transposon disruption of genes required for LPS O-polysaccharide biosynthesis is synthetically lethal with eipA deletion. This genetic connection between O-polysaccharide and eipA is corroborated by our discovery that eipA is essential in Brucella ovis, a naturally rough species that harbors mutations in several genes required for O-polysaccharide production. Conditional depletion of eipA expression in B. ovis results in a cell chaining phenotype, providing evidence that eipA directly or indirectly influences cell division in Brucella. We conclude that EipA is a molecular determinant of Brucella virulence that functions to maintain cell envelope integrity and influences cell division.

  • Organizational Affiliation

    Department of Biochemistry and Molecular Biology, The University of Chicago, Chicago, IL, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Uncharacterized Protein COG5400
A, B
163Brucella abortus 2308Mutation(s): 0 
Gene Names: BAB1_1612
Find proteins for Q2YQA6 (Brucella abortus (strain 2308))
Explore Q2YQA6 
Go to UniProtKB:  Q2YQA6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ2YQA6
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
A, B
Experimental Data & Validation

Experimental Data

Unit Cell:
Length ( Å )Angle ( ˚ )
a = 113.075α = 90
b = 113.075β = 90
c = 64.308γ = 120
Software Package:
Software NamePurpose
HKL-3000data reduction
HKL-3000data scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2017-02-08
    Type: Initial release
  • Version 1.1: 2017-02-15
    Changes: Derived calculations, Structure summary
  • Version 1.2: 2017-09-20
    Changes: Author supporting evidence
  • Version 1.3: 2017-11-01
    Changes: Author supporting evidence
  • Version 1.4: 2018-01-24
    Changes: Database references, Structure summary
  • Version 1.5: 2018-12-19
    Changes: Data collection, Database references
  • Version 1.6: 2020-01-01
    Changes: Author supporting evidence