NMR structure of the glycosylated conotoxin CcTx from Conus consors

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: LEAST RESTRAINT VIOLATION 

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This is version 2.0 of the entry. See complete history


Structure of the O-Glycosylated Conopeptide Cctx from Conus Consors Venom.

Hocking, H.G.Gerwig, G.J.Dutertre, S.Violette, A.Favreau, P.Stocklin, R.Kamerling, J.P.Boelens, R.

(2013) Chemistry 19: 870

  • DOI: https://doi.org/10.1002/chem.201202713
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The glycopeptide CcTx, isolated from the venom of the piscivorous cone snail Conus consors, belongs to the κA-family of conopeptides. These toxins elicit excitotoxic responses in the prey by acting on voltage-gated sodium channels. The structure of CcTx, a first in the κA-family, has been determined by high-resolution NMR spectroscopy together with the analysis of its O-glycan at Ser7. A new type of glycopeptide O-glycan core structure, here registered as core type 9, containing two terminal L-galactose units {α-L-Galp-(1→4)-α-D-GlcpNAc-(1→6)-[α-L-Galp-(1→2)-β-D-Galp-(1→3)-]α-D-GalpNAc-(1→O)}, is highlighted. A sequence comparison to other putative members of the κA-family suggests that O-linked glycosylation might be more common than previously thought. This observation alone underlines the requirement for more careful and in-depth investigations into this type of post-translational modification in conotoxins.

  • Organizational Affiliation

    NMR Spectroscopy, Bijvoet Center for Biomolecular Research, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands. h.hocking@tum.de

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CONOTOXIN CCTXA [auth P]30Conus consorsMutation(s): 0 
Find proteins for P58928 (Conus consors)
Explore P58928 
Go to UniProtKB:  P58928
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP58928
Sequence Annotations
  • Reference Sequence


Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-L-galactopyranose-(1-2)-beta-D-galactopyranose-(1-3)-[alpha-L-galactopyranose-(1-4)-2-acetamido-2-deoxy-alpha-D-glucopyranose-(1-6)]2-acetamido-2-deoxy-alpha-D-galactopyranoseB [auth A]5O-Glycosylation
Glycosylation Resources
GlyTouCan:  G96977QO
GlyCosmos:  G96977QO
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on HYP
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: LEAST RESTRAINT VIOLATION 

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-02-06
    Type: Initial release
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Other, Structure summary