2M3I

Characterization of a Novel Alpha4/6-Conotoxin TxIC from Conus textile that Potently Blocks alpha3beta4 Nicotinic Acetylcholine Receptors


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: Structures with the lowest MolProbity score 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Characterization of a Novel alpha-Conotoxin TxID from Conus textile That Potently Blocks Rat alpha 3 beta 4 Nicotinic Acetylcholine Receptors.

Luo, S.Zhangsun, D.Zhu, X.Wu, Y.Hu, Y.Christensen, S.Harvey, P.J.Akcan, M.Craik, D.J.McIntosh, J.M.

(2013) J.Med.Chem. 56: 9655-9663

  • DOI: 10.1021/jm401254c

  • PubMed Abstract: 
  • The α3β4 nAChRs are implicated in pain sensation in the PNS and addiction to nicotine in the CNS. We identified an α-4/6-conotoxin (CTx) TxID from Conus textile. The new toxin consists of 15 amino acid residues with two disulfide bonds. TxID was synt ...

    The α3β4 nAChRs are implicated in pain sensation in the PNS and addiction to nicotine in the CNS. We identified an α-4/6-conotoxin (CTx) TxID from Conus textile. The new toxin consists of 15 amino acid residues with two disulfide bonds. TxID was synthesized using solid phase methods, and the synthetic peptide was functionally tested on nAChRs heterologously expressed in Xenopus laevis oocytes. TxID blocked rat α3β4 nAChRs with a 12.5 nM IC50, which places it among the most potent α3β4 nAChR antagonists. TxID also blocked the closely related α6/α3β4 with a 94 nM IC50 but showed little activity on other nAChR subtypes. NMR analysis showed that two major structural isomers exist in solution, one of which adopts a regular α-CTx fold but with different surface charge distribution to other 4/6 family members. α-CTx TxID is a novel tool with which to probe the structure and function of α3β4 nAChRs.


    Organizational Affiliation

    Key Laboratory of Tropical Biological Resources, Ministry of Education, Key Lab for Marine Drug of Haikou, Hainan University , Haikou Hainan, 570228, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Alpha-conotoxin
A
16Conus lividusMutation(s): 0 
Find proteins for H9N3R7 (Conus lividus)
Go to UniProtKB:  H9N3R7
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
NH2
Query on NH2
A
NON-POLYMERH2 N

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Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: Structures with the lowest MolProbity score 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-12-04
    Type: Initial release
  • Version 1.1: 2014-01-15
    Type: Database references