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

Experimental Data Snapshot

  • Resolution: 1.71 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.216 

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This is version 1.4 of the entry. See complete history


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

  • DOI: https://doi.org/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.

  • Organizational Affiliation

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

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
175Stichodactyla helianthusMutation(s): 0 
Membrane Entity: Yes 
Find proteins for P07845 (Stichodactyla helianthus)
Explore P07845 
Go to UniProtKB:  P07845
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP07845
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.71 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.216 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 32.304α = 90
b = 119.735β = 90.04
c = 43.421γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-06-12
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-01-25
    Changes: Database references, Other
  • Version 1.4: 2024-02-07
    Changes: Data collection, Refinement description