1QUL

PHOSPHATE-BINDING PROTEIN MUTANT WITH ASP 137 REPLACED BY THR COMPLEX WITH CHLORINE AND PHOSPHATE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.187 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Modulation of a salt link does not affect binding of phosphate to its specific active transport receptor.

Yao, N.Ledvina, P.S.Choudhary, A.Quiocho, F.A.

(1996) Biochemistry 35: 2079-2085

  • DOI: 10.1021/bi952686r
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Electrostatic interactions are among the key forces determining the structure and function of proteins. These are exemplified in the liganded form of the receptor, a phosphate binding protein from Escherichia coli. The phosphate, completely dehydrate ...

    Electrostatic interactions are among the key forces determining the structure and function of proteins. These are exemplified in the liganded form of the receptor, a phosphate binding protein from Escherichia coli. The phosphate, completely dehydrated and buried in the receptor, is bound by 12 hydrogen bonds as well as a salt link with Arg 135. We have modulated the ionic attraction while preserving the hydrogen bonds by mutating Asp 137, also salt linked to Arg 135, to Asn, Gly or Thr. High-resolution crystallographic analysis revealed that Gly and Thr (but not Asn) mutant proteins have incorporated a more electronegative Cl- in place of the Asp carboxylate. That no dramatic effect on phosphate affinity was produced by these ionic perturbations indicates a major role for hydrogen bonds and other local dipoles in the binding and charge stabilization of ionic ligands.


    Related Citations: 
    • Fine Tuning the Specificity of the Periplasmic Phosphate Transport Receptor. Site-Directed Mutagenesis, Ligand Binding, and Crystallographic Studies
      Wang, Z.,Choudhary, A.,Ledvina, P.S.,Quiocho, F.A.
      (1994) J.Biol.Chem. 269: 25091
    • High Specificity of a Phosphate Transport Protein Determined by Hydrogen Bonds
      Luecke, H.,Quiocho, F.A.
      (1990) Nature 347: 402


    Organizational Affiliation

    Department of Biochemistry, Baylor College of Medicine, Houston, Texas 77030, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PHOSPHATE-BINDING PROTEIN
A
321Escherichia coli (strain K12)Mutation(s): 1 
Gene Names: pstS (phoS)
Find proteins for P0AG82 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AG82
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download SDF File 
Download CCD File 
A
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
CL
Query on CL

Download SDF File 
Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.187 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 41.970α = 90.00
b = 63.980β = 90.00
c = 123.970γ = 90.00
Software Package:
Software NamePurpose
X-PLORrefinement
SDMSdata scaling
X-PLORphasing
X-PLORmodel building
SDMSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1996-07-11
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance