Biological Assembly 1  

 3D View: Structure | 1D-3D View | Validation Report

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 3.10 kDa 
• Atom Count: 211 
• Modelled Residue Count: 30 
• Deposited Residue Count: 30 
• Unique protein chains: 1

2MN1

Solution Structure of kalata B1[W23WW]

• PDB DOI: 10.2210/pdb2MN1/pdb
• BMRB: 19874

• Classification: UNKNOWN FUNCTION
• Organism(s): Oldenlandia affinis
• Mutation(s): No 


• Deposited: 2014-03-26 Released: 2015-05-27 
• Deposition Author(s): Henriques, S.T., Huang, Y.H., Chaousis, S., Wang, C.K., Craik, D.J.

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Experimental Data Snapshot

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

Literature

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

• PubMed: 25099014 
• DOI: 10.1002/cbic.201402144
• Primary Citation of Related Structures:  
  2MN1


• 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.

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Organizational Affiliation: 

The University of Queensland, Institute for Molecular Bioscience, Carmody Road, St. Lucia, Brisbane, QLD 4072 (Australia). [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
kalata B1[W23WW]	A	30	Oldenlandia affinis	Mutation(s): 0  Gene Names: OAK1
UniProt
Find proteins for P56254 (Oldenlandia affinis) Explore P56254  Go to UniProtKB:  P56254

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 50 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 
• OLDERADO: 2MN1 Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2014-03-26 
• Released Date: 2015-05-27 
Deposition Author(s): Henriques, S.T., Huang, Y.H., Chaousis, S., Wang, C.K., Craik, D.J.

Revision History  

• Version 1.0: 2015-05-27
  Type: Initial release