1OSM

OSMOPORIN (OMPK36) FROM KLEBSIELLA PNEUMONIAE

• PDB DOI: https://doi.org/10.2210/pdb1OSM/pdb

• Classification: OUTER MEMBRANE PROTEIN
• Organism(s): Klebsiella pneumoniae
• Expression System: Escherichia coli
• Mutation(s): No 
• Membrane Protein: Yes  OPMPDBTMMemProtMDmpstruc


• Deposited: 1999-01-08 Released: 1999-07-26 
• Deposition Author(s): Dutzler, R., Schirmer, T.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.20 Å
• R-Value Free: 0.223 
• R-Value Work: 0.208 
• R-Value Observed: 0.208 

Literature

Crystal structure and functional characterization of OmpK36, the osmoporin of Klebsiella pneumoniae.

Dutzler, R., Rummel, G., Alberti, S., Hernandez-Alles, S., Phale, P., Rosenbusch, J., Benedi, V., Schirmer, T.

(1999) Structure 7: 425-434

• PubMed: 10196126 
• DOI: https://doi.org/10.1016/s0969-2126(99)80055-0
• Primary Citation of Related Structures:  
  1OSM


• PubMed Abstract: 
  

  Porins are channel-forming membrane proteins that confer solute permeability to the outer membrane of Gram-negative bacteria. In Escherichia coli, major nonspecific porins are matrix porin (OmpF) and osmoporin (OmpC), which show high sequence homology. In response to high osmolarity of the medium, OmpC is expressed at the expense of OmpF porin. Here, we study osmoporin of the pathogenic Klebsiella pneumoniae (OmpK36), which shares 87% sequence identity with E. coliOmpC in an attempt to establish why osmoporin is best suited to function at high osmotic pressure.

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Organizational Affiliation: 

Department of Structural Biology, Biozentrum University of Basel, CH-4056 Basel, Switzerland.

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 (software)

Macromolecule Content

• Total Structure Weight: 114.42 kDa 
• Atom Count: 8,100 
• Modelled Residue Count: 1,026 
• Deposited Residue Count: 1,026 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
OMPK36	A, B, C	342	Klebsiella pneumoniae	Mutation(s): 0  Membrane Entity: Yes
UniProt
Find proteins for Q48473 (Klebsiella pneumoniae) Explore Q48473  Go to UniProtKB:  Q48473

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
D12	D [auth A], E [auth A], F [auth A], G [auth A], H [auth A], I [auth A], J [auth A], K [auth A], L [auth A]	DODECANE C12 H26 SNRUBQQJIBEYMU-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.20 Å
• R-Value Free: 0.223 
• R-Value Work: 0.208 
• R-Value Observed: 0.208 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 191.8	α = 90
b = 76.8	β = 113.3
c = 223.4	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
MOSFLM	data reduction
CCP4	data scaling
ROTAVATA	data scaling
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1999-07-26 
Deposition Author(s): Dutzler, R., Schirmer, T.

Revision History  

• Version 1.0: 1999-07-26
  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: 2011-11-30
  Changes: Other
• Version 1.4: 2023-08-09
  Changes: Database references, Derived calculations, Other, Refinement description