6K2G

Structure of FraE in the monomer state

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.22 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.189 

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Literature

The Isolation of New Pore-Forming Toxins from the Sea AnemoneActinia fragaceaProvides Insights into the Mechanisms of Actinoporin Evolution.

Morante, K., Bellomio, A., Viguera, A.R., Gonzalez-Manas, J.M., Tsumoto, K., Caaveiro, J.M.M.

(2019) Toxins (Basel) 11

  • DOI: https://doi.org/10.3390/toxins11070401
  • Primary Citation of Related Structures:  
    6K2G

  • PubMed Abstract: 

    • Random mutations and selective pressure drive protein adaptation to the changing demands of the environment. As a consequence, nature favors the evolution of protein diversity. A group of proteins subject to exceptional environmental stress and known for their widespread diversity are the pore-forming hemolytic proteins from sea anemones, known as actinoporins ...

    Random mutations and selective pressure drive protein adaptation to the changing demands of the environment. As a consequence, nature favors the evolution of protein diversity. A group of proteins subject to exceptional environmental stress and known for their widespread diversity are the pore-forming hemolytic proteins from sea anemones, known as actinoporins. In this study, we identified and isolated new isoforms of actinoporins from the sea anemone Actinia fragacea (fragaceatoxins). We characterized their hemolytic activity, examined their stability and structure, and performed a comparative analysis of their primary sequence. Sequence alignment reveals that most of the variability among actinoporins is associated with non-functional residues. The differences in the thermal behavior among fragaceatoxins suggest that these variability sites contribute to changes in protein stability. In addition, the protein-protein interaction region showed a very high degree of identity (92%) within fragaceatoxins, but only 25% among all actinoporins examined, suggesting some degree of specificity at the species level. Our findings support the mechanism of evolutionary adaptation in actinoporins and reflect common pathways conducive to protein variability.

    Organizational Affiliation: 

    Department of Global Healthcare, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan. jose@phar.kyushu-u.ac.jp.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
FraE
A, B
179Actinia fragaceaMutation(s): 0 
Gene Names: FraC
UniProt
Find proteins for B9W5G6 (Actinia fragacea)
Explore B9W5G6 
Go to UniProtKB:  B9W5G6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB9W5G6
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.22 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.189 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.96α = 90
b = 42.89β = 97.64
c = 71.86γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Japan Society for the Promotion of ScienceJapan15K06962
Japan Society for the Promotion of ScienceJapan16H02420

Revision History  (Full details and data files)

  • Version 1.0: 2020-03-25
    Type: Initial release