1NT4

Crystal structure of Escherichia coli periplasmic glucose-1-phosphatase H18A mutant complexed with glucose-1-phosphate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.218 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Functional insights revealed by the crystal structures of Escherichia coli glucose-1-phosphatase.

Lee, D.C.Cottrill, M.A.Forsberg, C.W.Jia, Z.

(2003) J.Biol.Chem. 278: 31412-31418

  • DOI: 10.1074/jbc.M213154200

  • PubMed Abstract: 
  • The Escherichia coli periplasmic glucose-1-phosphatase is a member of the histidine acid phosphatase family and acts primarily as a glucose scavenger. Previous substrate profiling studies have demonstrated some of the intriguing properties of the enz ...

    The Escherichia coli periplasmic glucose-1-phosphatase is a member of the histidine acid phosphatase family and acts primarily as a glucose scavenger. Previous substrate profiling studies have demonstrated some of the intriguing properties of the enzyme, including its unique and highly selective inositol phosphatase activity. The enzyme is also potentially involved in pathogenic inositol phosphate signal transduction pathways via type III secretion into the host cell. We have determined the crystal structure of E. coli glucose-1-phosphatase in an effort to unveil the structural mechanism underlying such unique substrate specificity. The structure was determined by the method of multiwavelength anomalous dispersion using a tungstate derivative together with the H18A inactive mutant complex structure with glucose 1-phosphate at 2.4-A resolution. In the active site of glucose-1-phosphatase, there are two unique gating residues, Glu-196 and Leu-24, in addition to the conserved features of histidine acid phosphatases. Together they create steric and electrostatic constraints responsible for the unique selectivity of the enzyme toward phytate and glucose-1-phosphate as well as its unusually high pH optimum for the latter. Based on the structural characterization, we were able to derive simple structural principles that not only precisely explains the substrate specificity of glucose-1-phosphatase and the hydrolysis products of various inositol phosphate substrates but also rationalizes similar general characteristics across the histidine acid phosphatase family.


    Organizational Affiliation

    Department of Biochemistry, Queen's University, Kingston, Ontario K7L 3N6, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glucose-1-phosphatase
A, B
391Escherichia coli (strain K12)Gene Names: agp
EC: 3.1.3.10
Find proteins for P19926 (Escherichia coli (strain K12))
Go to UniProtKB:  P19926
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
G1P
Query on G1P

Download SDF File 
Download CCD File 
A, B
ALPHA-D-GLUCOSE-1-PHOSPHATE
C6 H13 O9 P
HXXFSFRBOHSIMQ-VFUOTHLCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.218 
  • Space Group: H 3
Unit Cell:
Length (Å)Angle (°)
a = 156.263α = 90.00
b = 156.263β = 90.00
c = 84.575γ = 120.00
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SHARPphasing
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-01-13
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance