1SBP

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

DOI: 10.2210/pdb1SBP/pdb

Classification: BINDING PROTEIN
Organism(s): Salmonella enterica subsp. enterica serovar Typhimurium
Mutation(s): No

Deposited: 1993-07-19 Released: 1993-10-31
Deposition Author(s): Sack, J.S., Quiocho, F.A.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 1.70 Å
R-Value Observed: 0.178

wwPDB Validation3D 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

PubMed: 8251939 Search on PubMedSearch on PubMed Central
DOI: 10.1002/pro.5560021010
Structures With Same Primary Citation

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 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:

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

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

Sulfate-Binding Protein Dislikes Protonated Oxyacids. A Molecular Explanation
Jacobson, B.L., Quiocho, F.A.
(1988) J Mol Biol 204: 783

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

Amino Acid Sequence of the Sulfate-Binding Protein from Salmonella Typhimurium Lt2
Isihara, H., Hogg, R.W.
(1980) J Biol Chem 255: 4614

Organizational Affiliation:

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

Macromolecules

Find similar proteins by: Sequence | Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
SULFATE-BINDING PROTEIN	A	310	Salmonella enterica subsp. enterica serovar Typhimurium	Mutation(s): 0
Find proteins for P02906 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)) Go to UniProtKB: P02906
Protein Feature View
Reference Sequence

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
SO4 Query on SO4 Download CCD File	A	SULFATE ION O₄ S QAOWNCQODCNURD-UHFFFAOYSA-L		Ligand Interaction