Solution Structure of kalata B1[W23WW]

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report

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Anticancer and toxic properties of cyclotides are dependent on phosphatidylethanolamine phospholipid targeting.

Henriques, S.T.Huang, Y.H.Chaousis, S.Wang, C.K.Craik, D.J.

(2014) Chembiochem 15: 1956-1965

  • DOI: https://doi.org/10.1002/cbic.201402144
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Cyclotides, ultrastable disulfide-rich cyclic peptides, can be engineered to bind and inhibit specific cancer targets. In addition, some cyclotides are toxic to cancer cells, though not much is known about their mechanisms of action. Here we delineated the potential mode of action of cyclotides towards cancer cells. A novel set of analogues of kalata B1 (the prototypic cyclotide) and kalata B2 and cycloviolacin O2 were examined for their membrane-binding affinity and selectivity towards cancer cells. By using solution-state NMR, surface plasmon resonance, flow cytometry and bioassays we show that cyclotides are toxic against cancer and non-cancerous cells and their toxicity correlates with their ability to target and disrupt lipid bilayers that contain phosphatidylethanolamine phospholipids. Our results suggest that the potential of cyclotides as anticancer therapeutics might best be realised by combining their amenability to epitope engineering with their ability to bind cancer cell membranes.

  • Organizational Affiliation

    The University of Queensland, Institute for Molecular Bioscience, Carmody Road, St. Lucia, Brisbane, QLD 4072 (Australia). s.henriques@uq.edu.au.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
kalata B1[W23WW]30Oldenlandia affinisMutation(s): 0 
Find proteins for P56254 (Oldenlandia affinis)
Explore P56254 
Go to UniProtKB:  P56254
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP56254
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-05-27
    Type: Initial release
  • Version 1.1: 2023-06-14
    Changes: Data collection, Database references, Derived calculations, Other