6O14

Crystal structure of the Aquifex aeolicus Wzt Carbohydrate Binding Domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.65 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.183 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

Structure and Ligand-Binding Properties of the O Antigen ABC Transporter Carbohydrate-Binding Domain.

Bi, Y.Zimmer, J.

(2020) Structure 28: 252

  • DOI: https://doi.org/10.1016/j.str.2019.11.020
  • Primary Citation of Related Structures:  
    6O14

  • PubMed Abstract: 

    A hallmark of Gram-negative bacteria is an asymmetric outer membrane containing lipopolysaccharides (LPSs) in the extracellular leaflet. LPS molecules consist of lipid A, which is connected to the inner and outer core oligosaccharides. This LPS core structure is extended in the periplasm by the O antigen, a variable and serotype-defining polysaccharide. In the ABC transporter-dependent LPS biosynthesis pathway, the WzmWzt transporter secretes the complete O antigen across the inner membrane for ligation to the LPS core. In some O antigen transporters, the nucleotide-binding domain of Wzt is fused C-terminally to a carbohydrate-binding domain (CBD) that interacts with the O antigen chain. Here, we present the crystal structure of the Aquifex aeolicus CBD that reveals a conserved flat and a variable twisted jelly-roll surface. The CBD dimer is stabilized by mutual β strand exchange. Microbial glycan array binding studies with the isolated CBD provide insights into its interaction with complex carbohydrates.


  • Organizational Affiliation

    School of Medicine, Department of Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, VA 22903, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ABC transporter
A, B
151Aquifex aeolicus VF5Mutation(s): 0 
Gene Names: abcT4aq_1094
UniProt
Find proteins for O67181 (Aquifex aeolicus (strain VF5))
Explore O67181 
Go to UniProtKB:  O67181
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO67181
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.65 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.183 
  • Space Group: P 63
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 128.345α = 90
b = 128.345β = 90
c = 45.158γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2020-01-15
    Type: Initial release
  • Version 1.1: 2020-02-19
    Changes: Database references
  • Version 1.2: 2023-10-11
    Changes: Data collection, Database references, Refinement description