Solution structure of ribbon isoform of CMrVIA lambda conotoxin

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 211 
  • Conformers Submitted: 16 
  • Selection Criteria: structures with the lowest energy 

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This is version 1.3 of the entry. See complete history


Solution Structures of Two Structural Isoforms of CMrVIA chi/lambda-Conotoxin

Kang, T.S.Jois, S.D.S.Kini, R.M.

(2006) Biomacromolecules 7: 2337-2346

  • DOI: https://doi.org/10.1021/bm060269w
  • Primary Citation of Related Structures:  
    2B5P, 2B5Q

  • PubMed Abstract: 

    alpha-Conotoxins possess a conserved four-cysteine framework and disulfide linkages (C(1)(-)(3), C(2)(-)(4)) that fold toward the globular conformation with absolute fidelity. Despite the presence of a similar conserved set of cysteine framework, chi/lambda-conotoxins adopt an alternate disulfide-pairing (C(1)(-)(4), C(2)(-)(3)) and its consequent ribbon conformation, exhibiting distinct biological activities from alpha-conotoxins. chi/lambda-Conotoxin CMrVIA (VCCGYKLCHOC-COOH) isolated from the venom of Conus marmoreus natively exists in the ribbon conformation and induces seizures in mice at a potency that is of three orders higher than the non-native globular form. We have chemically synthesized two isoforms of CMrVIA conotoxin in the ribbon and globular conformation and determined their structures by (1)H NMR spectroscopy. The ribbon (PDB ID 2B5P) and globular conformations (PBD ID 2B5Q) were calculated to have paired-wise backbone RMSDs of 0.48 +/- 0.1 and 0.58 +/- 0.1 A respectively. Unlike the native globular alpha-conotoxins, the globular canonical form of CMrVIA chi/lambda-conotoxin exhibited heterogeneity in its solution structure as noted by the presence of minor conformers and poorer RMSD of structure calculation. Paired-wise backbone comparison between the native ribbon and the non-native globular form of CMrVIA conotoxin revealed an RMSD of 4.73 A, emphasizing their distinct conformational differences. These structural data are essential for the understanding of the structure-function activity of chi/lambda-conotoxins, as well as unraveling the folding propensities of these short peptide toxins.

  • Organizational Affiliation

    Protein Science Laboratory, Department of Biological Sciences, National University of Singapore, 14 Science Drive 4, Block S3 #03-17 Singapore.


Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Lambda-conotoxin CMrVIA11N/AMutation(s): 1 
Find proteins for P58807 (Conus marmoreus)
Explore P58807 
Go to UniProtKB:  P58807
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP58807
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on HYP
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 211 
  • Conformers Submitted: 16 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-08-29
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2022-03-09
    Changes: Data collection, Database references, Derived calculations