6MJD

NMR Solution structure of GIIIC


Experimental Data Snapshot

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

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

NMR Structure of mu-Conotoxin GIIIC: Leucine 18 Induces Local Repacking of the N-Terminus Resulting in Reduced NaVChannel Potency.

Harvey, P.J.Kurniawan, N.D.Finol-Urdaneta, R.K.McArthur, J.R.Van Lysebetten, D.Dash, T.S.Hill, J.M.Adams, D.J.Durek, T.Craik, D.J.

(2018) Molecules 23: --

  • DOI: 10.3390/molecules23102715

  • PubMed Abstract: 
  • μ-Conotoxins are potent and highly specific peptide blockers of voltage-gated sodium channels. In this study, the solution structure of μ-conotoxin GIIIC was determined using 2D NMR spectroscopy and simulated annealing calculations. Despite high sequ ...

    μ-Conotoxins are potent and highly specific peptide blockers of voltage-gated sodium channels. In this study, the solution structure of μ-conotoxin GIIIC was determined using 2D NMR spectroscopy and simulated annealing calculations. Despite high sequence similarity, GIIIC adopts a three-dimensional structure that differs from the previously observed conformation of μ-conotoxins GIIIA and GIIIB due to the presence of a bulky, non-polar leucine residue at position 18. The side chain of L18 is oriented towards the core of the molecule and consequently the N-terminus is re-modeled and located closer to L18. The functional characterization of GIIIC defines it as a canonical μ-conotoxin that displays substantial selectivity towards skeletal muscle sodium channels (Na V ), albeit with ~2.5-fold lower potency than GIIIA. GIIIC exhibited a lower potency of inhibition of Na V 1.4 channels, but the same Na V selectivity profile when compared to GIIIA. These observations suggest that single amino acid differences that significantly affect the structure of the peptide do in fact alter its functional properties. Our work highlights the importance of structural factors, beyond the disulfide pattern and electrostatic interactions, in the understanding of the functional properties of bioactive peptides. The latter thus needs to be considered when designing analogues for further applications.


    Organizational Affiliation

    Institute for Molecular Bioscience, The University of Queensland, Brisbane 4072, Australia. Dorien.VanLysebetten@UGent.be.,Illawarra Health and Medical Research Institute, University of Wollongong, Wollongong 2522, Australia. djadams@uow.edu.au.,Illawarra Health and Medical Research Institute, University of Wollongong, Wollongong 2522, Australia. rfinolu@uow.edu.au.,Institute for Molecular Bioscience, The University of Queensland, Brisbane 4072, Australia. t.durek@uq.edu.au.,Institute for Molecular Bioscience, The University of Queensland, Brisbane 4072, Australia. thomas.dash@imb.uq.edu.au.,Institute for Molecular Bioscience, The University of Queensland, Brisbane 4072, Australia. justine.hill1@gmail.com.,Institute for Molecular Bioscience, The University of Queensland, Brisbane 4072, Australia. d.craik@imb.uq.edu.au.,Institute for Molecular Bioscience, The University of Queensland, Brisbane 4072, Australia. peta.harvey@imb.uq.edu.au.,Institute for Molecular Bioscience, The University of Queensland, Brisbane 4072, Australia. nyoman.kurniawan@cai.uq.edu.au.,Illawarra Health and Medical Research Institute, University of Wollongong, Wollongong 2522, Australia. jeffreym@uow.edu.au.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ARG-ASP-CYS-CYS-THR-HYP-HYP-LYS-LYS-CYS-LYS-ASP-ARG-ARG-CYS-LYS-HYP-LEU-LYS-CYS-CYS-ALA-NH2
A
23Conus geographusMutation(s): 0 
Find proteins for P05482 (Conus geographus)
Go to UniProtKB:  P05482
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: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2018-11-28
    Type: Initial release