2GBP

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å

wwPDB Validation 3D Report Full Report


This is version 1.3 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


  • 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 fo ...

    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: 
    • 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.USA 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
    • 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


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
D-GALACTOSE/D-GLUCOSE BINDING PROTEIN
A
309Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: mglB
Find proteins for P0AEE5 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AEE5
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
BGC
Query on BGC

Download SDF File 
Download CCD File 
A
BETA-D-GLUCOSE
C6 H12 O6
WQZGKKKJIJFFOK-VFUOTHLCSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
BGCKd: 100 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 66.000α = 90.00
b = 37.050β = 106.80
c = 61.570γ = 90.00
Software Package:
Software NamePurpose
PROLSQrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1990-07-15
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-11-29
    Type: Derived calculations, Other