1LIH

THREE-DIMENSIONAL STRUCTURES OF THE LIGAND-BINDING DOMAIN OF THE BACTERIAL ASPARTATE RECEPTOR WITH AND WITHOUT A LIGAND

DOI: 10.2210/pdb1LIH/pdb

Classification: CHEMOTAXIS
Organism(s): Salmonella enterica subsp. enterica serovar Typhimurium
Expression System: Escherichia coli
Mutation(s): No

Deposited: 1995-04-18 Released: 1995-09-15
Deposition Author(s): Kim, S.-H., Scott, W., Yeh, J.I., Prive, G.G., Milburn, M.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 2.20 Å
R-Value Work: 0.188
R-Value Observed: 0.188

wwPDB Validation 3D Report Full Report

This is version 1.2 of the entry. See complete history.

Literature

Three-dimensional structures of the ligand-binding domain of the bacterial aspartate receptor with and without a ligand.

Milburn, M.V., Prive, G.G., Milligan, D.L., Scott, W.G., Yeh, J., Jancarik, J., Koshland Jr., D.E., Kim, S.H.

(1991) Science 254: 1342-1347

PubMed: 1660187 Search on PubMed
DOI: 10.1126/science.1660187
Primary Citation of Related Structures:
1LIH, 2LIG

PubMed Abstract:

The three-dimensional structure of an active, disulfide cross-linked dimer of the ligand-binding domain of the Salmonella typhimurium aspartate receptor and that of an aspartate complex have been determined by x-ray crystallographic methods at 2.4 and 2.0 angstrom (A) resolution, respectively. A single subunit is a four-alpha-helix bundle with two long amino-terminal and carboxyl-terminal helices and two shorter helices that form a cylinder 20 A in diameter and more than 70 A long. The two subunits in the disulfide-bonded dimer are related by a crystallographic twofold axis in the apo structure, but by a noncrystallographic twofold axis in the aspartate complex structure. The latter structure reveals that the ligand binding site is located more than 60 A from the presumed membrane surface and is at the interface of the two subunits. Aspartate binds between two alpha helices from one subunit and one alpha helix from the other in a highly charged pocket formed by three arginines. The comparison of the apo and aspartate complex structures shows only small structural changes in the individual subunits, except for one loop region that is disordered, but the subunits appear to change orientation relative to each other. The structures of the two forms of this protein provide a step toward understanding the mechanisms of transmembrane signaling.

Related Citations:

The Three-Dimensional Structure of the Ligand-Binding Domain of a Wild-Type Bacterial Chemotaxis Receptor. Structural Comparison to the Cross-Linked Mutant Forms and Conformational Changes Upon Ligand Binding
Yeh, J.I., Biemann, H.-P., Pandit, J., Koshland, D.E., Kim, S.-H.
(1993) J Biol Chem 268: 9787

Refined Structures of the Ligand-Binding Domain of the Aspartate Receptor from Salmonella Typhimurium
Scott, W.G., Milligan, D.L., Milburn, M.V., Prive, G.G., Yeh, J., Koshland Junior, D.E., Kim, S.-H.
(1993) J Mol Biol 232: 555

Organizational Affiliation:

Department of Chemistry, University of California, Berkeley 94720.

Macromolecules

Find similar proteins by:

(by identity cutoff) | 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ASPARTATE RECEPTOR	A	164	Salmonella enterica subsp. enterica serovar Typhimurium	Mutation(s): 0
UniProt
Find proteins for P02941 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)) Explore P02941 Go to UniProtKB: P02941
Protein Feature View Expand
Reference Sequence

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
PHN (Subject of Investigation/LOI) Query on PHN Download Ideal Coordinates CCD File SDF format, chain B [auth A] MOL2 format, chain B [auth A]	B [auth A]	1,10-PHENANTHROLINE C₁₂ H₈ N₂ DGEZNRSVGBDHLK-UHFFFAOYSA-N		Ligand Interaction