1FU3 | pdb_00001fu3

THREE-DIMENSIONAL STRUCTURE IN SOLUTION OF THE SODIUM CHANNEL AGONIST/ANTAGONIST DELTA-CONOTOXIN TXVIA

• PDB DOI: https://doi.org/10.2210/pdb1FU3/pdb

• Classification: METAL TRANSPORT INHIBITOR
• Organism(s): Conus textile
• Mutation(s): No 
• Membrane Protein: Yes  OPM


• Deposited: 2000-09-14 Released: 2002-09-20 
• Deposition Author(s): Kohno, T., Sasaki, T., Fainzilber, M., Sato, K.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Literature

Three-dimensional solution structure of the sodium channel agonist/antagonist delta-conotoxin TxVIA.

Kohno, T., Sasaki, T., Kobayashi, K., Fainzilber, M., Sato, K.

(2002) J Biological Chem 277: 36387-36391

• PubMed: 12145313 
• DOI: https://doi.org/10.1074/jbc.M206833200
• Primary Citation Related Structures: 
  1FU3


• PubMed Abstract: 
  

  The three-dimensional solution structure of delta-conotoxin TxVIA, a 27-mer peptide agonist/antagonist of sodium channels, was determined by two-dimensional (1)H NMR spectroscopy with simulated annealing calculations. A total of 20 converged structures of delta-conotoxin TxVIA were obtained on the basis of 360 distance constraints obtained from nuclear Overhauser effect connectivities, 28 torsion angle constraints, and 27 constraints associated with hydrogen bonds and disulfide bonds. The atomic root mean square difference about the averaged coordinate positions is 0.35 +/- 0.07 A for the backbone atoms (N, C(alpha), C) and 0.98 +/- 0.14 A for all heavy atoms of the entire peptide. The molecular structure of delta-conotoxin TxVIA is composed of a short triple-stranded antiparallel beta-sheet. The overall beta-sheet topology is +2x, -1, which is the same as those for other conotoxins. However, the three-dimensional structure of delta-conotoxin TxVIA has an unusual hydrophobic patch on one side of the molecule, which may play an important role in the sodium channel binding. These results provide a molecular basis for understanding the mechanism of sodium channel modulation through the toxin-channel interaction and insight into the discrimination of different ion channels.

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Organizational Affiliation: 
• Mitsubishi Kagaku Institute of Life Sciences (MITILS), 11 Minamiooya, Machida, Tokyo 194-8511, Japan. [e-mail]

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 3.04 kDa 
• Atom Count: 206 
• Modeled Residue Count: 27 
• Deposited Residue Count: 27 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
DELTA-CONOTOXIN TXVIA	A	27	N/A	Mutation(s): 0  Membrane Entity: Yes
UniProt
Find proteins for P18511 (Conus textile) Explore P18511  Go to UniProtKB:  P18511

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Structure Validation

Entry History 

Deposition Data

• Released Date: 2002-09-20 
Deposition Author(s): Kohno, T., Sasaki, T., Fainzilber, M., Sato, K.

Revision History  

• Version 1.0: 2002-09-20
  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: 2022-02-23
  Changes: Data collection, Database references, Derived calculations
• Version 1.4: 2024-11-20
  Changes: Data collection, Structure summary