1OLA

THE STRUCTURAL BASIS OF MULTISPECIFICITY IN THE OLIGOPEPTIDE-BINDING PROTEIN OPPA

• PDB DOI: https://doi.org/10.2210/pdb1OLA/pdb

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


• Deposited: 1994-04-26 Released: 1994-07-31 
• Deposition Author(s): Tame, J., Wilkinson, A.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Observed: 0.167 

Literature

The structural basis of sequence-independent peptide binding by OppA protein.

Tame, J.R., Murshudov, G.N., Dodson, E.J., Neil, T.K., Dodson, G.G., Higgins, C.F., Wilkinson, A.J.

(1994) Science 264: 1578-1581

• PubMed: 8202710 
• DOI: https://doi.org/10.1126/science.8202710
• Primary Citation of Related Structures:  
  1OLA


• PubMed Abstract: 
  

  Specific protein-ligand interactions are critical for cellular function, and most proteins select their partners with sharp discrimination. However, the oligopeptide-binding protein of Salmonella typhimurium (OppA) binds peptides of two to five amino acid residues without regard to sequence. The crystal structure of OppA reveals a three-domain organization, unlike other periplasmic binding proteins. In OppA-peptide complexes, the ligands are completely enclosed in the protein interior, a mode of binding that normally imposes tight specificity. The protein fulfills the hydrogen bonding and electrostatic potential of the ligand main chain and accommodates the peptide side chains in voluminous hydrated cavities.

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Organizational Affiliation: 

Department of Chemistry, University of York, UK.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 59.82 kDa 
• Atom Count: 4,463 
• Modelled Residue Count: 521 
• Deposited Residue Count: 521 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
OLIGO-PEPTIDE BINDING PROTEIN	A	517	Salmonella enterica subsp. enterica serovar Typhimurium	Mutation(s): 0
UniProt
Find proteins for P06202 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)) Explore P06202  Go to UniProtKB:  P06202

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
PEPTIDE VAL-LYS-PRO-GLY	B	4	N/A	Mutation(s): 0

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
IUM	C [auth A], D [auth A]	URANYL (VI) ION O2 U IZLHQJIUOZHTLW-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Observed: 0.167 
• Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 106.5	α = 90
b = 74.5	β = 90
c = 70	γ = 90

Software Package:

Software Name	Purpose
PROLSQ	refinement

Structure Validation

Entry History 

Deposition Data

• Released Date: 1994-07-31 
Deposition Author(s): Tame, J., Wilkinson, A.J.

Revision History  

• Version 1.0: 1994-07-31
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2024-06-05
  Changes: Data collection, Database references, Derived calculations, Other
• Version 1.4: 2024-10-30
  Changes: Structure summary