Biological Assembly 1  

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

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

Biological Assembly 2  

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

Biological assembly 2 assigned by authors and generated by PQS (software)

Macromolecule Content

• Total Structure Weight: 39.16 kDa 
• Atom Count: 2,900 
• Modelled Residue Count: 350 
• Deposited Residue Count: 350 
• Unique protein chains: 1

 1O71

Crystal structure of the water-soluble state of the pore-forming cytolysin Sticholysin II complexed with glycerol

• PDB DOI: 10.2210/pdb1O71/pdb

• Classification: CYTOLYSIN
• Organism(s): Stichodactyla helianthus
• Mutation(s): No 


• Deposited: 2002-10-23 Released: 2003-11-13 
• Deposition Author(s): Mancheno, J.M., Martinez-Ripoll, M., Gavilanes, J.G., Hermoso, J.A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.26 Å
• R-Value Free: 0.269 
• R-Value Work: 0.215 
• R-Value Observed: 0.215 

Literature

Crystal and Electron Microscopy Structures of Sticholysin II Actinoporin Reveal Insights Into the Mechanism of Membrane Pore Formation

Mancheno, J.M., Martin-Benito, J., Martinez-Ripoll, M., Gavilanes, J.G., Hermoso, J.A.

(2003) Structure 11: 1319

• PubMed: 14604522 
• DOI: 10.1016/j.str.2003.09.019
• Primary Citation of Related Structures:  
  1GWY, 1O71, 1O72


• PubMed Abstract: 
  

Sticholysin II (StnII) is a pore-forming protein (PFP) produced by the sea anemone Stichodactyla helianthus. We found out that StnII exists in a monomeric soluble state but forms tetramers in the presence of a lipidic interface. Both structures have been independently determined at 1.7 A and 18 A resolution, respectively, by using X-ray crystallography and electron microscopy of two-dimensional crystals. Besides, the structure of soluble StnII complexed with phosphocholine, determined at 2.4 A resolution, reveals a phospholipid headgroup binding site, which is located in a region with an unusually high abundance of aromatic residues. Fitting of the atomic model into the electron microscopy density envelope suggests that while the beta sandwich structure of the protein remains intact upon oligomerization, the N-terminal region and a flexible and highly basic loop undergo significant conformational changes. These results provide the structural basis for the membrane recognition step of actinoporins and unexpected insights into the oligomerization step.

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Organizational Affiliation: 

Grupo de Cristalografía Macromolecular y Biología Estructural, Instituto Rocasolano, CSIC, Serrano 119, 28006 Madrid, Spain.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
STICHOLYSIN II	A, B	175	Stichodactyla helianthus	Mutation(s): 0
UniProt
Find proteins for P07845 (Stichodactyla helianthus) Explore P07845  Go to UniProtKB:  P07845

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GOL	C [auth A], D [auth A], E [auth A], F [auth B], G [auth B], H [auth B]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.26 Å
• R-Value Free: 0.269 
• R-Value Work: 0.215 
• R-Value Observed: 0.215 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 32.86	α = 90
b = 43.57	β = 92.43
c = 120.03	γ = 90

Software Package:

Software Name	Purpose
CNS	refinement
MOSFLM	data reduction

Structure Validation

Entry History 

Deposition Data

• Released Date: 2003-11-13 
Deposition Author(s): Mancheno, J.M., Martinez-Ripoll, M., Gavilanes, J.G., Hermoso, J.A.

Revision History  

• Version 1.0: 2003-11-13
  Type: Initial release
  
• Version 1.1: 2011-05-08
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance