NMR structure of AnIB[Y(SO3)16Y]-OH

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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Posttranslational modifications of alpha-conotoxins: sulfotyrosine and C-terminal amidation stabilise structures and increase acetylcholine receptor binding.

Ho, T.N.T.Lee, H.S.Swaminathan, S.Goodwin, L.Rai, N.Ushay, B.Lewis, R.J.Rosengren, K.J.Conibear, A.C.

(2021) RSC Med Chem 12: 1574-1584

  • DOI: https://doi.org/10.1039/d1md00182e
  • Primary Citation of Related Structures:  
    7N0T, 7N1Z, 7N20, 7N21, 7N22, 7N23, 7N24, 7N25, 7N26

  • PubMed Abstract: 

    Conotoxins are peptides found in the venoms of marine cone snails. They are typically highly structured and stable and have potent activities at nicotinic acetylcholine receptors, which make them valuable research tools and promising lead molecules for drug development. Many conotoxins are also highly modified with posttranslational modifications such as proline hydroxylation, glutamic acid gamma-carboxylation, tyrosine sulfation and C-terminal amidation, amongst others. The role of these posttranslational modifications is poorly understood, and it is unclear whether the modifications interact directly with the binding site, alter conotoxin structure, or both. Here we synthesised a set of twelve conotoxin variants bearing posttranslational modifications in the form of native sulfotyrosine and C-terminal amidation and show that these two modifications in combination increase their activity at nicotinic acetylcholine receptors and binding to soluble acetylcholine binding proteins, respectively. We then rationalise how these functional differences between variants might arise from stabilization of the three-dimensional structures and interactions with the binding sites, using high-resolution nuclear magnetic resonance data. This study demonstrates that posttranslational modifications can modulate interactions between a ligand and receptor by a combination of structural and binding alterations. A deeper mechanistic understanding of the role of posttranslational modifications in structure-activity relationships is essential for understanding receptor biology and could help to guide structure-based drug design.

  • Organizational Affiliation

    Institute for Molecular Bioscience, The University of Queensland St Lucia 4072 Brisbane Australia.


Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Alpha-conotoxin AnIB17Conus anemoneMutation(s): 0 
Find proteins for P0C1V7 (Conus anemone)
Explore P0C1V7 
Go to UniProtKB:  P0C1V7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0C1V7
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 & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
The University Grants Committee, Research Grants Council (RGC)Australia616535
The University Grants Committee, Research Grants Council (RGC)Australia613982

Revision History  (Full details and data files)

  • Version 1.0: 2021-11-10
    Type: Initial release
  • Version 1.1: 2023-06-14
    Changes: Other