1QS3

NMR SOLUTION CONFORMATION OF AN ANTITOXIC ANALOG OF ALPHA-CONOTOXIN GI

  • Classification: TOXIN
  • Mutation(s): No 

  • Deposited: 1999-06-25 Released: 1999-10-06 
  • Deposition Author(s): Mok, K.H., Han, K.-H.

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 30 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

NMR solution conformation of an antitoxic analogue of alpha-conotoxin GI: identification of a common nicotinic acetylcholine receptor alpha 1-subunit binding surface for small ligands and alpha-conotoxins.

Mok, K.H.Han, K.H.

(1999) Biochemistry 38: 11895-11904

  • DOI: 10.1021/bi990558n
  • Primary Citation of Related Structures:  
    1QS3

  • PubMed Abstract: 
  • The three-dimensional solution conformation of an 11-residue antitoxic analogue of alpha-conotoxin GI, des-Glu1-[Cys3Ala]-des-Cys13-conotoxin GI (CANPACGRHYS-NH(2), designated "GI-15" henceforth), has been determined using two-dimensional (1)H NMR spectroscopy ...

    The three-dimensional solution conformation of an 11-residue antitoxic analogue of alpha-conotoxin GI, des-Glu1-[Cys3Ala]-des-Cys13-conotoxin GI (CANPACGRHYS-NH(2), designated "GI-15" henceforth), has been determined using two-dimensional (1)H NMR spectroscopy. The disulfide loop region (1C-6C) and the C-terminal tail (8R-11S) are connected by a flexible hinge formed near 7G, and the pairwise backbone rmsds for the former and the latter are 0.58 and 0.65 A, respectively. Superpositioning GI-15 with the structure of alpha-conotoxin GI shows that the two share an essentially identical fold in the common first disulfide loop region (1C-6C). However, the absence of the second disulfide loop in GI-15 results in segmental motion of the C-terminal half, causing the key receptor subtype selectivity residue 8R (Arg9 in alpha-conotoxin GI) to lose its native spatial orientation. The combined features of structural equivalence in the disulfide loop and a mobile C-terminal tail appear to be responsible for the activity of GI-15 as a competitive antagonist against native toxin. Electrostatic surface potential comparisons of the first disulfide region of GI-15 with other alpha-conotoxins or receptor-bound states of acetylcholine and d-tubocurarine show a common protruding surface that may serve as the minimal binding determinant for the neuromuscular acetylcholine receptor alpha 1-subunit. On the basis of the original "Conus toxin macrosite model" [Olivera, B. M., Rivier, J., Scott, J. K., Hillyard, D. R., and Cruz, L. J. (1991) J. Biol. Chem. 266, 1923-1936], we propose a revised binding model which incorporates these results.


    Related Citations: 
    • Conus Peptides as Chemical Probes for Receptors and Ion Channels
      (1993) Chem Rev 93: 1923
    • Development of Antagonists of des-Glu1-Conotoxin GI
      (1990) Peptides: Chemistry, Structure And Biology, J Rivier And G B Marshall, Eds, Escom, Leiden --: 505
    • Paralytic Activity of (des-Glu1)Conotoxin GI Analogs in the Mouse Diaphragm
      (1989) Int J Pept Protein Res 34: 455

    Organizational Affiliation

    Biomolecular Structure Research Unit, Korea Research Institute of Bioscience and Biotechnology, Taejon, Republic of Korea.



Macromolecules
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DES-GLU1-[CYS3ALA]-DES-CYS13-ALPHA CONOTOXIN GIA12N/AMutation(s): 0 
UniProt
Find proteins for P01519 (Conus geographus)
Explore P01519 
Go to UniProtKB:  P01519
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 30 
  • Selection Criteria: structures with the lowest energy 
  • OLDERADO: 1QS3 Olderado

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 1999-06-25 
  • Released Date: 1999-10-06 
  • Deposition Author(s): Mok, K.H., Han, K.-H.

Revision History  (Full details and data files)

  • Version 1.0: 1999-10-06
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2014-03-12
    Changes: Database references