1OIB

PHOSPHATE-BINDING PROTEIN MUTANT T141D


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Work: 0.166 
  • R-Value Observed: 0.166 

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:  
    1OIB, 1QUL, 1QUK, 1QUJ, 1QUI, 2ABH

  • 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 dehydrated and buried in the receptor, is bound by 12 hydrogen bonds as well as a salt link with Arg 135 ...

    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
      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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PHOSPHATE-BINDING PROTEINA, B321Escherichia coliMutation(s): 1 
Gene Names: phoS
UniProt
Find proteins for P0AG82 (Escherichia coli (strain K12))
Explore P0AG82 
Go to UniProtKB:  P0AG82
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Work: 0.166 
  • R-Value Observed: 0.166 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.22α = 90
b = 39.59β = 92.8
c = 113.61γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
SDMSdata reduction
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1997-04-21
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance