1GLG

CRYSTALLOGRAPHIC ANALYSIS OF THE EPIMERIC AND ANOMERIC SPECIFICITY OF THE PERIPLASMIC TRANSPORT(SLASH)CHEMOTACTIC PROTEIN RECEPTOR FOR D-GLUCOSE AND D-GALACTOSE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystallographic analysis of the epimeric and anomeric specificity of the periplasmic transport/chemosensory protein receptor for D-glucose and D-galactose.

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

(1994) Biochemistry 33: 4762-4768


  • PubMed Abstract: 
  • The D-glucose/D-galactose-binding protein (M(r) = 33,000) found in the periplasm of bacterial cells serves as the primary high-affinity receptor of active transport for and chemotaxis toward both sugar epimers. This protein from Escherichia coli bind ...

    The D-glucose/D-galactose-binding protein (M(r) = 33,000) found in the periplasm of bacterial cells serves as the primary high-affinity receptor of active transport for and chemotaxis toward both sugar epimers. This protein from Escherichia coli binds D-glucose with a Kd of 2 x 10(-7) M, which is about 2 times tighter than D-galactose. The 2.0-A resolution crystal structure of the binding protein complexed with D-galactose has been refined to a crystallographic R-factor of 0.167. This structure, combined with that previously refined for the complex with D-glucose [Vyas, N.K., Vyas., M. N., & Quiocho, F. A. (1988) Science 242, 1290-1295], provides understanding, in atomic detail, of recognition of sugar epimers and anomers. In the two complex structures, the sugar ring is positioned identically in the binding site, and each hydroxyl group common to both is involved in very similar cooperative hydrogen-bonding interactions with protein residues and ordered water molecules. Only the beta-anomer of both monosaccharides is bound, with Asp154 OD1 primarily responsible for accepting a hydrogen bond from the anomeric hydroxyl. Recognition of both sugar epimers is accomplished principally by hydrogen bonding of Asp14 OD1 with the equatorial OH4 of D-glucose and OD2 with the axial OH4 of D-galactose. These results are reconciled with equilibrium and fast kinetics data, which indicate binding of both anomers of the two sugars, and further compared with sugar recognition by other periplasmic sugar-binding proteins with specificities for arabinose/galactose/fucose, maltooligosaccharides, and ribose.


    Related Citations: 
    • Sugar and Signal-Transducer Binding Sites of the Escherichia Coli Galactose Receptor Protein
      Vyas, N.K.,Vyas, M.N.,Quiocho, F.A.
      (1988) Science 242: 1290
    • Comparison of the Periplasmic Receptors for L-Arabinose, D-Galactose, and D-Ribose
      Vyas, N.K.,Vyas, M.N.,Quiocho, F.A.
      (1991) J.Biol.Chem. 266: 5226
    • 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

    Department of Biochemistry, Howard Hughes Medical Institute, Houston, Texas 77030.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
GALACTOSE/GLUCOSE-BINDING PROTEIN
A
309Escherichia coli (strain K12)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
GAL
Query on GAL

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 65.980α = 90.00
b = 37.090β = 105.83
c = 61.900γ = 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: 1994-05-31
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance