1ZLC

Solution Conformation of alpha-conotoxin PIA


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

Solution structure of alpha-conotoxin PIA, a novel antagonist of alpha6 subunit containing nicotinic acetylcholine receptors

Chi, S.-W.Lee, S.-H.Kim, D.-H.Kim, J.-S.Olivera, B.M.McIntosh, J.M.Han, K.-H.

(2005) Biochem.Biophys.Res.Commun. 338: 1990-1997

  • DOI: 10.1016/j.bbrc.2005.10.176

  • PubMed Abstract: 
  • alpha-Conotoxin PIA is a novel nicotinic acetylcholine receptor (nAChR) antagonist isolated from Conus purpurascens that targets nAChR subtypes containing alpha6 and alpha3 subunits. alpha-conotoxin PIA displays 75-fold higher affinity for rat alpha6 ...

    alpha-Conotoxin PIA is a novel nicotinic acetylcholine receptor (nAChR) antagonist isolated from Conus purpurascens that targets nAChR subtypes containing alpha6 and alpha3 subunits. alpha-conotoxin PIA displays 75-fold higher affinity for rat alpha6/alpha3beta2beta3 nAChRs than for rat alpha3beta2 nAChRs. We have determined the three-dimensional structure of alpha-conotoxin PIA by nuclear magnetic resonance spectroscopy. The alpha-conotoxin PIA has an "omega-shaped" overall topology as other alpha4/7 subfamily conotoxins. Yet, unlike other neuronally targeted alpha4/7-conotoxins, its N-terminal tail Arg1-Asp2-Pro3 protrudes out of its main molecular body because Asp2-Pro3-Cys4-Cys5 forms a stable type I beta-turn. In addition, a kink introduced by Pro15 in the second loop of this toxin provides a distinct steric and electrostatic environment from those in alpha-conotoxins MII and GIC. By comparing the structure of alpha-conotoxin PIA with other functionally related alpha-conotoxins we suggest structural features in alpha-conotoxin PIA that may be associated with its unique receptor recognition profile.


    Organizational Affiliation

    Protein Analysis and Design Laboratory, Division of Drug Discovery, Korea Research Institute of Bioscience and Biotechnology, Yusong P. O. Box 115, Daejon, Republic of Korea.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Alpha-conotoxin PIA
A
19Conus purpurascensMutation(s): 0 
Find proteins for P69658 (Conus purpurascens)
Go to UniProtKB:  P69658
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
NH2
Query on NH2
A
NON-POLYMERH2 N

--

Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 1ZLC Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-05-02
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance