3HCQ

Structural analysis of the choline binding protein ChoX in a semi-closed and ligand-free conformation


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.89 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.242 
  • R-Value Observed: 0.245 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

Structural analysis of the choline-binding protein ChoX in a semi-closed and ligand-free conformation.

Oswald, C.Smits, S.H.Hoing, M.Bremer, E.Schmitt, L.

(2009) Biol Chem 390: 1163-1170

  • DOI: https://doi.org/10.1515/BC.2009.113
  • Primary Citation of Related Structures:  
    3HCQ

  • PubMed Abstract: 

    The periplasmic ligand-binding protein ChoX is part of the ABC transport system ChoVWX that imports choline as a nutrient into the soil bacterium Sinorhizobium meliloti. We have recently reported the crystal structures of ChoX in complex with its ligands choline and acetylcholine and the structure of a fully closed but substrate-free state of ChoX. This latter structure revealed an architecture of the ligand-binding site that is superimposable to the closed, ligand-bound form of ChoX. We report here the crystal structure of ChoX in an unusual, ligand-free conformation that represents a semi-closed form of ChoX. The analysis revealed a subdomain movement in the N-lobe of ChoX. Comparison with the two well-characterized substrate binding proteins, MBP and HisJ, suggests the presence of a similar subdomain in these proteins.


  • Organizational Affiliation

    Institute of Biochemistry, Heinrich Heine University Düsseldorf, Universitätsstr. 1, D-40225 Düsseldorf, Germany.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Putative choline ABC transporter, periplasmic solute-binding component
A, B
298Sinorhizobium melilotiMutation(s): 1 
Gene Names: choXR02399SMc02737
UniProt
Find proteins for Q92N37 (Rhizobium meliloti (strain 1021))
Explore Q92N37 
Go to UniProtKB:  Q92N37
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ92N37
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.89 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.242 
  • R-Value Observed: 0.245 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 34.1α = 90
b = 232.5β = 90.2
c = 47.3γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHASERphasing
REFMACrefinement
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-10-13
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2021-10-13
    Changes: Data collection, Database references
  • Version 1.3: 2023-09-06
    Changes: Data collection, Refinement description