Crystal structure of the periplasmic sugar binding protein ChvE

Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.149 
  • R-Value Observed: 0.151 

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Agrobacterium tumefaciens recognizes its host environment using ChvE to bind diverse plant sugars as virulence signals.

Hu, X.Zhao, J.Degrado, W.F.Binns, A.N.

(2013) Proc Natl Acad Sci U S A 110: 678-683

  • DOI: https://doi.org/10.1073/pnas.1215033110
  • Primary Citation of Related Structures:  
    3URM, 3UUG

  • PubMed Abstract: 

    Agrobacterium tumefaciens is a broad host range plant pathogen that combinatorially recognizes diverse host molecules including phenolics, low pH, and aldose monosaccharides to activate its pathogenic pathways. Chromosomal virulence gene E (chvE) encodes a periplasmic-binding protein that binds several neutral sugars and sugar acids, and subsequently interacts with the VirA/VirG regulatory system to stimulate virulence (vir) gene expression. Here, a combination of genetics, X-ray crystallography, and isothermal calorimetry reveals how ChvE binds the different monosaccharides and also shows that binding of sugar acids is pH dependent. Moreover, the potency of a sugar for vir gene expression is modulated by a transport system that also relies on ChvE. These two circuits tune the overall system to respond to sugar concentrations encountered in vivo. Finally, using chvE mutants with restricted sugar specificities, we show that there is host variation in regard to the types of sugars that are limiting for vir induction.

  • Organizational Affiliation

    Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, PA 19104, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Multiple sugar-binding periplasmic receptor ChvE
A, B
330Agrobacterium fabrum str. C58Mutation(s): 0 
Gene Names: AGR_C_4267Atu2348chvE
Find proteins for P25548 (Agrobacterium fabrum (strain C58 / ATCC 33970))
Explore P25548 
Go to UniProtKB:  P25548
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP25548
Sequence Annotations
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.149 
  • R-Value Observed: 0.151 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 130.076α = 90
b = 130.076β = 90
c = 64.676γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-11-28
    Type: Initial release
  • Version 1.1: 2013-01-23
    Changes: Database references
  • Version 1.2: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary
  • Version 1.3: 2023-09-13
    Changes: Data collection, Database references, Refinement description, Structure summary