2NS3

Solution structure of ribbon BuIA


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


This is version 1.4 of the entry. See complete history


Literature

Structure of alpha-conotoxin BuIA: influences of disulfide connectivity on structural dynamics

Jin, A.H.Brandstaetter, H.Nevin, S.T.Tan, C.C.Clark, R.J.Adams, D.J.Alewood, P.F.Craik, D.J.Daly, N.L.

(2007) BMC Struct Biol 7: 28-28

  • DOI: https://doi.org/10.1186/1472-6807-7-28
  • Primary Citation of Related Structures:  
    2NS3

  • PubMed Abstract: 

    Alpha-conotoxins have exciting therapeutic potential based on their high selectivity and affinity for nicotinic acetylcholine receptors. The spacing between the cysteine residues in alpha-conotoxins is variable, leading to the classification of sub-families. BuIA is the only alpha-conotoxin containing a 4/4 cysteine spacing and thus it is of significant interest to examine the structure of this conotoxin. In the current study we show the native globular disulfide connectivity of BuIA displays multiple conformations in solution whereas the non-native ribbon isomer has a single well-defined conformation. Despite having multiple conformations in solution the globular form of BuIA displays activity at the nicotinic acetylcholine receptor, contrasting with the lack of activity of the structurally well-defined ribbon isomer. These findings are opposite to the general trends observed for alpha-conotoxins where the native isomers have well-defined structures and the ribbon isomers are generally disordered. This study thus highlights the influence of the disulfide connectivity of BuIA on the dynamics of the three-dimensional structure.


  • Organizational Affiliation

    Institute for Molecular Bioscience, Australian Research Council Special Research Centre for Functional and Applied Genomics, The University of Queensland, Brisbane QLD, Australia. a.jin@imb.uq.edu.au


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Alpha-conotoxin BuIA14N/AMutation(s): 0 
UniProt
Find proteins for P69657 (Conus bullatus)
Explore P69657 
Go to UniProtKB:  P69657
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP69657
Sequence Annotations
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  • 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

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-09-25
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2022-03-16
    Changes: Data collection, Database references, Derived calculations
  • Version 1.3: 2023-12-27
    Changes: Data collection
  • Version 1.4: 2024-10-16
    Changes: Structure summary