2POR

STRUCTURE OF PORIN REFINED AT 1.8 ANGSTROMS RESOLUTION

• PDB DOI: https://doi.org/10.2210/pdb2POR/pdb

• Classification: INTEGRAL MEMBRANE PROTEIN PORIN
• Organism(s): Rhodobacter capsulatus
• Mutation(s): No 
• Membrane Protein: Yes  OPMPDBTMMemProtMD


• Deposited: 1992-04-24 Released: 1993-07-15 
• Deposition Author(s): Weiss, M.S., Schulz, G.E.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Work: 0.186 

Literature

Structure of porin refined at 1.8 A resolution.

Weiss, M.S., Schulz, G.E.

(1992) J Mol Biol 227: 493-509

• PubMed: 1328651 
• DOI: https://doi.org/10.1016/0022-2836(92)90903-w
• Primary Citation of Related Structures:  
  2POR


• PubMed Abstract: 
  

  The crystal structure of porin from Rhodobacter capsulatus has been refined using the simulated annealing method. The final model consists of all 301 amino acid residues well obeying standard geometry, three calcium ions, 274 solvent molecules, three detergent molecules and one unknown ligand modeled as a detergent molecule. The final crystallographic R-factor is 18.6% based on 42,851 independent reflections in the resolution range 10 to 1.8 A. The model is described in detail.

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Organizational Affiliation: 

Institut für Organische Chemie und Biochemie der Universität, Freiburg, Germany.

Biological Assembly 1  

Global Symmetry: Cyclic - C3  (Explore in 3D)
Global Stoichiometry: Homo 3-mer - A3 

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

Macromolecule Content

• Total Structure Weight: 32.9 kDa 
• Atom Count: 2,589 
• Modelled Residue Count: 301 
• Deposited Residue Count: 301 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PORIN	A	301	Rhodobacter capsulatus	Mutation(s): 0  Membrane Entity: Yes
UniProt
Find proteins for P31243 (Rhodobacter capsulatus) Explore P31243  Go to UniProtKB:  P31243

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
C8E	E [auth A], F [auth A], G [auth A], H [auth A]	(HYDROXYETHYLOXY)TRI(ETHYLOXY)OCTANE C16 H34 O5 FEOZZFHAVXYAMB-UHFFFAOYSA-N
CA	B [auth A], C [auth A], D [auth A]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Work: 0.186 
• Space Group: H 3

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 92.3	α = 90
b = 92.3	β = 90
c = 146.2	γ = 120

Software Package:

Software Name	Purpose
X-PLOR	refinement

Structure Validation

Entry History 

Deposition Data

• Released Date: 1993-07-15 
Deposition Author(s): Weiss, M.S., Schulz, G.E.

Revision History  

• Version 1.0: 1993-07-15
  Type: Initial release
  
• Version 1.1: 2008-03-25
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Derived calculations, Version format compliance
• Version 1.3: 2011-11-16
  Changes: Atomic model
• Version 1.4: 2017-11-29
  Changes: Derived calculations, Other
• Version 1.5: 2024-02-21
  Changes: Data collection, Database references, Derived calculations