High Resolution Glucose Bound Crystal Structure of GGBP

Experimental Data Snapshot

  • Resolution: 0.92 Å
  • R-Value Free: 0.130 
  • R-Value Work: 0.110 
  • R-Value Observed: 0.118 

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Conformational changes of glucose/galactose-binding protein illuminated by open, unliganded, and ultra-high-resolution ligand-bound structures.

Borrok, M.J.Kiessling, L.L.Forest, K.T.

(2007) Protein Sci 16: 1032-1041

  • DOI: https://doi.org/10.1110/ps.062707807
  • Primary Citation of Related Structures:  
    2FVY, 2FW0

  • PubMed Abstract: 

    D-Glucose/D-Galactose-binding protein (GGBP) mediates chemotaxis toward and active transport of glucose and galactose in a number of bacterial species. GGBP, like other periplasmic binding proteins, can exist in open (ligand-free) and closed (ligand-bound) states. We report a 0.92 angstroms resolution structure of GGBP from Escherichia coli in the glucose-bound state and the first structure of an open, unbound form of GGBP (at 1.55 angstroms resolution). These structures vary in the angle between the two structural domains; the observed difference of 31 degrees arises from torsion angle changes in a three-segment hinge. A comparison with the closely related periplasmic receptors, ribose- and allose-binding proteins, shows that the GGBP hinge residue positions that undergo the largest conformational changes are different. Furthermore, the high-quality data collected for the atomic resolution glucose-bound structure allow for the refinement of specific hydrogen atom positions, the assignment of alternate side chain conformations, the first description of CO(2) trapped after radiation-induced decarboxylation, and insight into the role of the exo-anomeric effect in sugar binding. Together, these structures provide insight into how the hinge-bending movement of GGBP facilitates ligand binding, transport, and signaling.

  • Organizational Affiliation

    Department of Biochemistry, University of Wisconsin, Madison, Wisconsin 53706, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
D-galactose-binding periplasmic protein309Escherichia coliMutation(s): 0 
Gene Names: mglB
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
Sequence Annotations
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Resolution: 0.92 Å
  • R-Value Free: 0.130 
  • R-Value Work: 0.110 
  • R-Value Observed: 0.118 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 119.989α = 90
b = 36.238β = 124.5
c = 80.101γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling
HKL-2000data collection
HKL-2000data reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-02-06
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Atomic model, Version format compliance
  • Version 1.3: 2019-07-24
    Changes: Data collection, Derived calculations, Refinement description
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Structure summary
  • Version 2.1: 2020-09-02
    Changes: Structure summary
  • Version 2.2: 2020-10-21
    Changes: Derived calculations
  • Version 2.3: 2024-02-14
    Changes: Data collection, Database references
  • Version 2.4: 2024-04-03
    Changes: Refinement description