2MDQ

A Novel 4/7-Conotoxin LvIA from Conus lividus that Selectively Blocks 3 2 vs. 6/3 2 3 Nicotinic Acetylcholine Receptors


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 1.2 of the entry. See complete history

Literature

A novel alpha 4/7-conotoxin LvIA from Conus lividus that selectively blocks alpha 3 beta 2 vs. alpha 6/ alpha 3 beta 2 beta 3 nicotinic acetylcholine receptors.

Luo, S.Zhangsun, D.Schroeder, C.I.Zhu, X.Hu, Y.Wu, Y.Weltzin, M.M.Eberhard, S.Kaas, Q.Craik, D.J.McIntosh, J.M.Whiteaker, P.

(2014) Faseb J. 28: 1842-1853

  • DOI: 10.1096/fj.13-244103

  • PubMed Abstract: 
  • This study was performed to discover and characterize the first potent α3β2-subtype-selective nicotinic acetylcholine receptor (nAChR) ligand. A novel α4/7-conotoxin, α-CTxLvIA, was cloned from Conus lividus. Its pharmacological profile at Xenopus la ...

    This study was performed to discover and characterize the first potent α3β2-subtype-selective nicotinic acetylcholine receptor (nAChR) ligand. A novel α4/7-conotoxin, α-CTxLvIA, was cloned from Conus lividus. Its pharmacological profile at Xenopus laevis oocyte-expressed rat nAChR subtypes was determined by 2-electrode voltage-clamp electrophysiology, and its 3-dimensional (3D) structure was determined by NMR spectroscopy. α-CTx LvIA is a 16-aa C-terminally-amidated peptide with 2-disulfide bridges. Using rat subunits expressed in Xenopus oocytes, we found the highest affinity of α-CTxLvIA was for α3β2 nAChRs (IC50 8.7 nM), where blockade was reversible within 2 min. IC50 values were >100 nM at α6/α3β2β3, α6/α3β4, and α3β4 nAChRs, and ≥3 μM at all other subtypes tested. α3β2 vs. α6β2 subtype selectivity was confirmed for human-subunit nAChRs with much greater preference (300-fold) for α3β2 over α6β2 nAChRs. This is the first α-CTx reported to show high selectivity for human α3β2 vs. α6β2 nAChRs. α-CTxLvIA adopts two similarly populated conformations water: one (assumed to be bioactive) is highly structured, whereas the other is mostly random coil in nature. Selectivity differences with the similarly potent, but less selective, α3β2 nAChR antagonist α-CTx PeIA probably reside within the three residues, which differ in loop 2, given their otherwise similar 3D structures. α4/7-CTx LvIA is a new, potent, selective α3β2 nAChR antagonist, which will enable detailed studies of α3β2 nAChR structure, function, and physiological roles.


    Organizational Affiliation

    1Key Laboratory of Tropical Biological Resources, Ministry of Education, Hainan University; Haikou, Hainan, 570228 China. luosulan2003@163.com.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Alpha-conotoxin-like
A
17Conus lividusN/A
Find proteins for L8BU87 (Conus lividus)
Go to UniProtKB:  L8BU87
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 energy 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2013-09-16 
  • Released Date: 2014-02-12 
  • Deposition Author(s): Schroeder, C.I.

Revision History 

  • Version 1.0: 2014-02-12
    Type: Initial release
  • Version 1.1: 2014-02-26
    Type: Database references
  • Version 1.2: 2014-04-16
    Type: Database references