1JLO

Solution Structure of the Noncompetitive Skeletal Muscle Nicotinic Acetylcholine Receptor Antagonist Psi-conotoxin PIIIE


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 13 
  • Selection Criteria: back calculated data agree with experimental NOESY spectrum, structures with the least restraint violations, structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

An Improved Solution Structure for psi-Conotoxin Piiie

Van Wagoner, R.M.Ireland, C.M.

(2003) Biochemistry 42: 6347-6352

  • DOI: 10.1021/bi027274e

  • PubMed Abstract: 
  • A revised, high-resolution structure of psi-conotoxin Piiie (psi-Piiie), a noncompetitive inhibitor of the nicotinic acetylcholine receptor (nAChR), produced through the use of NMR and molecular modeling calculations is presented. The original struct ...

    A revised, high-resolution structure of psi-conotoxin Piiie (psi-Piiie), a noncompetitive inhibitor of the nicotinic acetylcholine receptor (nAChR), produced through the use of NMR and molecular modeling calculations is presented. The original structures of psi-Piiie had a relatively high degree of disorder, particularly in the conformation of the disulfide bridges. Our studies utilized (13)C-labeling of selected cysteine residues allowing the resolution of all problems of resonance overlap for the cysteine residues. The improved data were used to produce a new set of structures by a molecular modeling process incorporating relaxation matrix methods for the determination of interproton distance restraints and a combination of distance geometry and simulated annealing for structure generation. The structures produced are very well converged with the RMSD of backbone atom positions of the main body of the peptide improving from 0.73 to 0.13 A. Other indicators of correlation with the experimental data and quality of covalent geometry showed significant improvement in the new structures. The overall conformation of the peptide backbone is similar between the two determinations with the exception of the N-terminus. This difference leads to a significant effect on the predicted distribution of positive charge within psi-Piiie, a property likely to influence interpretation of future mutational studies.


    Related Citations: 
    • Three-dimensional Solution Structure of Conotoxin psi-PIIIE, an Acetylcholine Gated Ion Channel Antagonist
      Mitchell, S.S.,Shon, K.J.,Foster, M.P.,Davis, D.R.,Olivera, B.M.,Ireland, C.M.
      (1998) Biochemistry 37: 1215
    • A Noncompetitive Peptide Inhibitor of the Nicotinic Acetylcholine Receptor from Conus purpurascens Venom
      Shon, K.J.,Grilley, M.,Jacobsen, R.,Cartier, G.E.,Hopkins, C.,Gray, W.R.,Watkins, M.,Hillyard, D.R.,Rivier, J.,Torres, J.,Yoshikami, D.,Olivera, B.M.
      (1997) Biochemistry 36: 9581


    Organizational Affiliation

    Department of Medicinal Chemistry, University of Utah, Salt Lake City, Utah 84112, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PSI-CONOTOXIN PIIIE
A
25Conus purpurascensN/A
Find proteins for P56529 (Conus purpurascens)
Go to UniProtKB:  P56529
Small Molecules
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
NH2
Query on NH2
A
NON-POLYMERH2 N

--

HYP
Query on HYP
A
L-PEPTIDE LINKINGC5 H9 N O3PRO
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 13 
  • Selection Criteria: back calculated data agree with experimental NOESY spectrum, structures with the least restraint violations, structures with the lowest energy 
  • Olderado: 1JLO Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-06-24
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2011-08-24
    Type: Atomic model