1BXW

OUTER MEMBRANE PROTEIN A (OMPA) TRANSMEMBRANE DOMAIN

• PDB DOI: https://doi.org/10.2210/pdb1BXW/pdb

• Classification: MEMBRANE PROTEIN
• Organism(s): Escherichia coli BL21(DE3)
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 
• Membrane Protein: Yes  OPMPDBTMMemProtMD


• Deposited: 1998-10-03 Released: 1998-10-14 
• Deposition Author(s): Schulz, G.E., Pautsch, A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.235 
• R-Value Work: 0.189 

Literature

Structure of the outer membrane protein A transmembrane domain.

Pautsch, A., Schulz, G.E.

(1998) Nat Struct Biol 5: 1013-1017

• PubMed: 9808047 
• DOI: https://doi.org/10.1038/2983
• Primary Citation of Related Structures:  
  1BXW


• PubMed Abstract: 
  

  The outer membrane protein A of Escherichia coli (OmpA) is an intensely studied example in the field of membrane protein folding. We have determined the structure of the OmpA transmembrane domain consisting of residues 1-171, by X-ray diffraction analysis, to a resolution of 2.5 A. It consists of a regular, extended eight-stranded beta-barrel and appears to be constructed like an inverse micelle with large water-filled cavities, but does not form a pore. Surprisingly, the cavities seem to be highly conserved during evolution. The structure corroborates the concept that all outer membrane proteins consist of beta-barrels. The structure constitutes a beta-barrel membrane anchor that appears to be the outer membrane equivalent of the single-chain alpha-helix anchor of the inner membrane.

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Organizational Affiliation: 

Institut für Organische Chemie und Biochemie, Albert-Ludwigs-Universität, Freiburg im Breisgau, Germany.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 19.2 kDa 
• Atom Count: 1,390 
• Modelled Residue Count: 172 
• Deposited Residue Count: 172 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (OUTER MEMBRANE PROTEIN A)	A	172	Escherichia coli BL21(DE3)	Mutation(s): 3  Gene Names: OMPA Membrane Entity: Yes
UniProt
Find proteins for P0A910 (Escherichia coli (strain K12)) Explore P0A910  Go to UniProtKB:  P0A910

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
C8E	B [auth A]	(HYDROXYETHYLOXY)TRI(ETHYLOXY)OCTANE C16 H34 O5 FEOZZFHAVXYAMB-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.235 
• R-Value Work: 0.189 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 69.18	α = 90
b = 77.95	β = 91.52
c = 50.93	γ = 90

Software Package:

Software Name	Purpose
SHARP	phasing
REFMAC	refinement
XDS	data reduction
CCP4	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 1998-10-14 
Deposition Author(s): Schulz, G.E., Pautsch, A.

Revision History  

• Version 1.0: 1998-10-14
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2017-11-29
  Changes: Advisory
• Version 1.4: 2018-03-14
  Changes: Database references
• Version 1.5: 2023-02-15
  Changes: Advisory, Database references, Derived calculations
• Version 1.6: 2024-05-22
  Changes: Data collection