Biological Assembly 1  

 3D View: Structure

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 55.83 kDa 
• Atom Count: 4035 
• Modelled Residue Count: 471 
• Deposited Residue Count: 500 
• Unique protein chains: 1

1PFO

PERFRINGOLYSIN O

• DOI: 10.2210/pdb1PFO/pdb

• Classification: TOXIN
• Organism(s): Clostridium perfringens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 1997-07-31 Released: 1998-08-05 
• Deposition Author(s): Rossjohn, J., Parker, M.W.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.268 
• R-Value Work: 0.211 
• R-Value Observed: 0.211 

Literature

Structure of a cholesterol-binding, thiol-activated cytolysin and a model of its membrane form.

Rossjohn, J., Feil, S.C., McKinstry, W.J., Tweten, R.K., Parker, M.W.

(1997) Cell 89: 685-692

• PubMed: 9182756 
• DOI: 10.1016/s0092-8674(00)80251-2
• Primary Citation of Related Structures:  
  1PFO


• PubMed Abstract: 
  

The mechanisms by which proteins gain entry into membranes is a fundamental problem in biology. Here, we present the first crystal structure of a thiol-activated cytolysin, perfringolysin O, a member of a large family of toxins that kill eukaryotic cells by punching holes in their membranes. The molecule adopts an unusually elongated shape rich in beta sheet. We have used electron microscopy data to construct a detailed model of the membrane channel form of the toxin. The structures reveal a novel mechanism for membrane insertion. Surprisingly, the toxin receptor, cholesterol, appears to play multiple roles: targeting, promotion of oligomerization, triggering a membrane insertion competent form, and stabilizing the membrane pore.

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Organizational Affiliation: 

The Ian Potter Foundation Protein Crystallography Laboratory, St. Vincent's Institute of Medical Research, Fitzroy, Victoria, Australia.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PERFRINGOLYSIN O	A	500	Clostridium perfringens	Mutation(s): 0
Membrane protein Mpstruc	Group:  TRANSMEMBRANE PROTEINS: BETA-BARREL		Sub Group:  Adventitious Membrane Proteins: Beta-sheet Pore-forming Toxins/Attack Complexes	Protein:  Perfringolysin O (PFO) protomer
Find proteins for P0C2E9 (Clostridium perfringens (strain 13 / Type A)) Explore P0C2E9  Go to UniProtKB:  P0C2E9

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.268 
• R-Value Work: 0.211 
• R-Value Observed: 0.211 
• Space Group: C 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 46.987	α = 90
b = 178.292	β = 90
c = 174.207	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
DENZO	data reduction
SCALEPACK	data scaling
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1997-07-31 
• Released Date: 1998-08-05 
Deposition Author(s): Rossjohn, J., Parker, M.W.

Revision History  

• Version 1.0: 1998-08-05
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance