6CEG

Solution NMR structure of the omega conotoxin MoVIB from Conus moncuri

  • Classification: TOXIN
  • Organism(s): Conus

  • Deposited: 2018-02-11 Released: 2018-03-07 
  • Deposition Author(s): Rosengren, K.J.
  • Funding Organization(s): Australian Research Council (ARC) 

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

Novel analgesic omega-conotoxins from the vermivorous cone snail Conus moncuri provide new insights into the evolution of conopeptides.

Sousa, S.R.McArthur, J.R.Brust, A.Bhola, R.F.Rosengren, K.J.Ragnarsson, L.Dutertre, S.Alewood, P.F.Christie, M.J.Adams, D.J.Vetter, I.Lewis, R.J.

(2018) Sci Rep 8: 13397-13397

  • DOI: 10.1038/s41598-018-31245-4

  • PubMed Abstract: 
  • Cone snails are a diverse group of predatory marine invertebrates that deploy remarkably complex venoms to rapidly paralyse worm, mollusc or fish prey. ω-Conotoxins are neurotoxic peptides from cone snail venoms that inhibit Ca <sub>v </sub>2.2 volta ...

    Cone snails are a diverse group of predatory marine invertebrates that deploy remarkably complex venoms to rapidly paralyse worm, mollusc or fish prey. ω-Conotoxins are neurotoxic peptides from cone snail venoms that inhibit Ca v 2.2 voltage-gated calcium channel, demonstrating potential for pain management via intrathecal (IT) administration. Here, we isolated and characterized two novel ω-conotoxins, MoVIA and MoVIB from Conus moncuri, the first to be identified in vermivorous (worm-hunting) cone snails. MoVIA and MoVIB potently inhibited human Ca v 2.2 in fluorimetric assays and rat Ca v 2.2 in patch clamp studies, and both potently displaced radiolabeled ω-conotoxin GVIA ( 125 I-GVIA) from human SH-SY5Y cells and fish brain membranes (IC 50 2-9 pM). Intriguingly, an arginine at position 13 in MoVIA and MoVIB replaced the functionally critical tyrosine found in piscivorous ω-conotoxins. To investigate its role, we synthesized MoVIB-[R13Y] and MVIIA-[Y13R]. Interestingly, MVIIA-[Y13R] completely lost Ca v 2.2 activity and MoVIB-[R13Y] had reduced activity, indicating that Arg at position 13 was preferred in these vermivorous ω-conotoxins whereas tyrosine 13 is preferred in piscivorous ω-conotoxins. MoVIB reversed pain behavior in a rat neuropathic pain model, confirming that vermivorous cone snails are a new source of analgesic ω-conotoxins. Given vermivorous cone snails are ancestral to piscivorous species, our findings support the repurposing of defensive venom peptides in the evolution of piscivorous Conidae.


    Organizational Affiliation

    IMB Centre for Pain Research, Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD, 4072, Australia.,Institut des Biomolécules Max Mousseron, UMR 5247, Université Montpellier - CNRS, Place Eugène Bataillon, 34095, Montpellier Cedex 5, France.,School of Biomedical Sciences, Faculty of Medicine, The University of Queensland, Brisbane, QLD, 4072, Australia.,Discipline of Pharmacology, The University of Sydney, Sydney, NSW, 2006, Australia.,Illawarra Health and Medical Research Institute, University of Wollongong, Wollongong, NSW, 2522, Australia.,IMB Centre for Pain Research, Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD, 4072, Australia. r.lewis@imb.uq.edu.au.,School of Pharmacy, The University of Queensland, Brisbane, QLD, 4102, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
conotoxin MoVIB
A
30ConusMutation(s): 0 
Find proteins for A0A3S5WI22 (Conus)
Go to UniProtKB:  A0A3S5WI22
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
HYP
Query on HYP
A
L-PEPTIDE LINKINGC5 H9 N O3PRO
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 & Funding Information

Deposition Data

  • Deposited Date: 2018-02-11 
  • Released Date: 2018-03-07 
  • Deposition Author(s): Rosengren, K.J.

Funding OrganizationLocationGrant Number
Australian Research Council (ARC)AustraliaFT130100890

Revision History 

  • Version 1.0: 2018-03-07
    Type: Initial release
  • Version 1.1: 2018-09-19
    Type: Data collection, Database references
  • Version 1.2: 2020-01-01
    Type: Author supporting evidence, Data collection