1SBP

1.7 ANGSTROMS REFINED STRUCTURE OF SULFATE-BINDING PROTEIN INVOLVED IN ACTIVE TRANSPORT AND NOVEL MODE OF SULFATE BINDING


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Dominant role of local dipoles in stabilizing uncompensated charges on a sulfate sequestered in a periplasmic active transport protein.

He, J.J.Quiocho, F.A.

(1993) Protein Sci. 2: 1643-1647

  • DOI: 10.1002/pro.5560021010

  • PubMed Abstract: 
  • Electrostatic interactions are among the key factors determining the structure and function of proteins. Here we report experimental results that illuminate the functional importance of local dipoles to these interactions. The refined 1.7-A X-ray str ...

    Electrostatic interactions are among the key factors determining the structure and function of proteins. Here we report experimental results that illuminate the functional importance of local dipoles to these interactions. The refined 1.7-A X-ray structure of the liganded form of the sulfate-binding protein, a primary sulfate active transport receptor of Salmonella typhimurium, shows that the sulfate dianion is completely buried and bound by hydrogen bonds (mostly main-chain peptide NH groups) and van der Waals forces. The sulfate is also closely linked, via one of these peptide units, to a His residue. It is also adjacent to the N-termini of three alpha-helices, of which the two shortest have their C-termini "capped" by Arg residues. Site-directed mutagenesis of the recombinant Escherichia coli sulfate receptor had no effect on sulfate-binding activity when an Asn residue was substituted for the positively charged His and the two Arg (changed singly and together) residues. These results, combined with other observations, further solidify the idea that stabilization of uncompensated charges in a protein is a highly localized process that involves a collection of local dipoles, including those of peptide units confined to the first turns of helices. The contribution of helix macrodipoles appears insignificant.


    Related Citations: 
    • Sulfate-Binding Protein Dislikes Protonated Oxyacids. A Molecular Explanation
      Jacobson, B.L.,Quiocho, F.A.
      (1988) J.Mol.Biol. 204: 783
    • Amino Acid Sequence of the Sulfate-Binding Protein from Salmonella Typhimurium Lt2
      Isihara, H.,Hogg, R.W.
      (1980) J.Biol.Chem. 255: 4614
    • The 2 Angstroms Resolution Structure of the Sulfate-Binding Protein Involved in Active Transport in Salmonella Typhimurium
      Pflugrath, J.W.,Quiocho, F.A.
      (1988) J.Mol.Biol. 200: 163
    • Engineered Interdomain Disulfide in the Periplasmic Receptor for Sulfate Transport Reduces Flexibility. Site-Directed Mutagenesis and Ligand-Binding Studies
      Jacobson, B.L.,He, J.J.,Vermersch, P.S.,Lemon, D.D.,Quiocho, F.A.
      (1991) J.Biol.Chem. 266: 5220
    • Sulphate Sequestered in the Sulphate-Binding Protein of Salmonella Typhimurium is Bound Solely by Hydrogen Bonds
      Pflugrath, J.W.,Quiocho, F.A.
      (1985) Nature 314: 257


    Organizational Affiliation

    Howard Hughes Medical Institute, Baylor College of Medicine, Houston, Texas 77030.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SULFATE-BINDING PROTEIN
A
310Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)Mutation(s): 0 
Gene Names: sbp
Find proteins for P02906 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Go to UniProtKB:  P02906
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 40.770α = 90.00
b = 49.370β = 90.00
c = 141.030γ = 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: 1993-10-31
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance