Solution study of cGm9a

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

wwPDB Validation   3D Report Full Report

This is version 1.4 of the entry. See complete history


Transforming conotoxins into cyclotides: Backbone cyclization of P-superfamily conotoxins.

Akcan, M.Clark, R.J.Daly, N.L.Conibear, A.C.de Faoite, A.Heghinian, M.D.Sahil, T.Adams, D.J.Mari, F.Craik, D.J.

(2015) Biopolymers 104: 682-692

  • DOI: https://doi.org/10.1002/bip.22699
  • Primary Citation of Related Structures:  
    2MSO, 2MSQ

  • PubMed Abstract: 

    Peptide backbone cyclization is a widely used approach to improve the activity and stability of small peptides but until recently it had not been applied to peptides with multiple disulfide bonds. Conotoxins are disulfide-rich conopeptides derived from the venoms of cone snails that have applications in drug design and development. However, because of their peptidic nature, they can suffer from poor bioavailability and poor stability in vivo. In this study two P-superfamily conotoxins, gm9a and bru9a, were backbone cyclized by joining the N- and C-termini with short peptide linkers using intramolecular native chemical ligation chemistry. The cyclized derivatives had conformations similar to the native peptides showing that backbone cyclization can be applied to three disulfide-bonded peptides with cystine knot motifs. Cyclic gm9a was more potent at high voltage-activated (HVA) calcium channels than its acyclic counterpart, highlighting the value of this approach in developing active and stable conotoxins containing cyclic cystine knot motifs.

  • Organizational Affiliation

    Health Innovations Research Institute, RMIT University, Bundoora, VIC, 3083, Australia.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Conotoxin Gm9.130Conus gloriamarisMutation(s): 0 
Find proteins for Q9GU57 (Conus gloriamaris)
Explore Q9GU57 
Go to UniProtKB:  Q9GU57
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9GU57
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-07-22
    Type: Initial release
  • Version 1.1: 2015-12-09
    Changes: Database references
  • Version 1.2: 2016-02-03
    Changes: Database references
  • Version 1.3: 2023-06-14
    Changes: Data collection, Database references, Derived calculations, Other
  • Version 1.4: 2023-12-27
    Changes: Advisory, Data collection, Derived calculations