3URM

Crystal structure of the periplasmic sugar binding protein ChvE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.149 
  • R-Value Observed: 0.151 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

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: 10.1073/pnas.1215033110
  • Structures With Same Primary Citation

  • 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) enc ...

    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.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
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))
Go to UniProtKB:  P25548
Protein Feature View
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GAL
Query on GAL

Download CCD File 
A, B
BETA-D-GALACTOSE
C6 H12 O6
WQZGKKKJIJFFOK-FPRJBGLDSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • 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
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-11-28
    Type: Initial release
  • Version 1.1: 2013-01-23
    Changes: Database references