2GBP

SUGAR AND SIGNAL-TRANSDUCER BINDING SITES OF THE ESCHERICHIA COLI GALACTOSE CHEMORECEPTOR PROTEIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Observed: 0.146 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Sugar and signal-transducer binding sites of the Escherichia coli galactose chemoreceptor protein.

Vyas, N.K.Vyas, M.N.Quiocho, F.A.

(1988) Science 242: 1290-1295

  • DOI: 10.1126/science.3057628
  • Primary Citation of Related Structures:  
    2GBP

  • PubMed Abstract: 
  • D-galactose-binding (or chemoreceptor) protein of Escherichia coli serves as an initial component for both chemotaxis towards galactose and glucose and high-affinity active transport of the two sugars. Well-refined x-ray structures of the liganded forms of the wild-type and a mutant protein isolated from a strain defective in chemotaxis but fully competent in transport have provided a molecular view of the sugar-binding site and of a site for interacting with the Trg transmembrane signal transducer ...

    D-galactose-binding (or chemoreceptor) protein of Escherichia coli serves as an initial component for both chemotaxis towards galactose and glucose and high-affinity active transport of the two sugars. Well-refined x-ray structures of the liganded forms of the wild-type and a mutant protein isolated from a strain defective in chemotaxis but fully competent in transport have provided a molecular view of the sugar-binding site and of a site for interacting with the Trg transmembrane signal transducer. The geometry of the sugar-binding site, located in the cleft between the two lobes of the bilobate protein, is novel in that it is designed for tight binding and sequestering of either the alpha or beta anomer of the D-stereoisomer of the 4-epimers galactose and glucose. Binding specificity and affinity are conferred primarily by polar planar side-chain residues that form intricate networks of cooperative and bidentate hydrogen bonds with the sugar substrates, and secondarily by aromatic residues that sandwich the pyranose ring. Each of the pairs of anomeric hydroxyls and epimeric hydroxyls is recognized by a distinct Asp residue. The site for interaction with the transducer is about 18 A from the sugar-binding site. Mutation of Gly74 to Asp at this site, concomitant with considerable changes in the local ordered water structures, contributes to the lack of productive interaction with the transmembrane signal transducer.


    Related Citations: 
    • A Novel Calcium Binding Site in the Galactose-Binding Protein of Bacterial Transport and Chemotaxis
      Vyas, N.K., Vyas, M.N., Quiocho, F.A.
      (1987) Nature 327: 635
    • The 3 Angstroms Resolution Structure of a D-Galactose-Binding Protein for Transport and Chemotaxis in Escherichia Coli
      Vyas, N.K., Vyas, M.N., Quiocho, F.A.
      (1983) Proc Natl Acad Sci U S A 80: 1792
    • Preliminary Crystallographic Data of Receptors for Transport and Chemotaxis in Escherichia Coli. D-Galactose and Maltose-Binding Proteins
      Quiocho, F.A., Meador, W.E., Pflugrath, J.W.
      (1979) J Mol Biol 133: 181

    Organizational Affiliation

    Howard Hughes Medical Institute, Baylor College of Medicine, Houston, TX 77030.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
D-GALACTOSE/D-GLUCOSE BINDING PROTEINA309Escherichia coliMutation(s): 0 
UniProt
Find proteins for P0AEE5 (Escherichia coli (strain K12))
Explore P0AEE5 
Go to UniProtKB:  P0AEE5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0AEE5
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BGC
Query on BGC

Download Ideal Coordinates CCD File 
B [auth A]beta-D-glucopyranose
C6 H12 O6
WQZGKKKJIJFFOK-VFUOTHLCSA-N
 Ligand Interaction
CA
Query on CA

Download Ideal Coordinates CCD File 
C [auth A]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
BGC Binding MOAD:  2GBP Kd: 100 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Observed: 0.146 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 66α = 90
b = 37.05β = 106.8
c = 61.57γ = 90
Software Package:
Software NamePurpose
PROLSQrefinement

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1990-07-15
    Type: Initial release
  • Version 1.1: 2008-03-03
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-11-29
    Changes: Derived calculations, Other
  • Version 1.4: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary