6BTV

Solution NMR structures for CcoTx-II

  • Classification: TOXIN
  • Organism(s): Ceratogyrus marshalli
  • Mutation(s): Yes 

  • Deposited: 2017-12-07 Released: 2018-05-09 
  • Deposition Author(s): Agwa, A.J., Schroeder, C.I.
  • Funding Organization(s): National Health and Medical Research Council (NHMRC, Australia)

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Gating modifier toxins isolated from spider venom: Modulation of voltage-gated sodium channels and the role of lipid membranes.

Agwa, A.J.Peigneur, S.Chow, C.Y.Lawrence, N.Craik, D.J.Tytgat, J.King, G.F.Henriques, S.T.Schroeder, C.I.

(2018) J Biol Chem 293: 9041-9052

  • DOI: 10.1074/jbc.RA118.002553
  • Primary Citation of Related Structures:  
    6BR0, 6BTV

  • PubMed Abstract: 
  • Gating modifier toxins (GMTs) are venom-derived peptides isolated from spiders and other venomous creatures and modulate activity of disease-relevant voltage-gated ion channels and are therefore being pursued as therapeutic leads. The amphipathic surface profile of GMTs has prompted the proposal that some GMTs simultaneously bind to the cell membrane and voltage-gated ion channels in a trimolecular complex ...

    Gating modifier toxins (GMTs) are venom-derived peptides isolated from spiders and other venomous creatures and modulate activity of disease-relevant voltage-gated ion channels and are therefore being pursued as therapeutic leads. The amphipathic surface profile of GMTs has prompted the proposal that some GMTs simultaneously bind to the cell membrane and voltage-gated ion channels in a trimolecular complex. Here, we examined whether there is a relationship among spider GMT amphipathicity, membrane binding, and potency or selectivity for voltage-gated sodium (Na V ) channels. We used NMR spectroscopy and in silico calculations to examine the structures and physicochemical properties of a panel of nine GMTs and deployed surface plasmon resonance to measure GMT affinity for lipids putatively found in proximity to Na V channels. Electrophysiology was used to quantify GMT activity on Na V 1.7, an ion channel linked to chronic pain. Selectivity of the peptides was further examined against a panel of Na V channel subtypes. We show that GMTs adsorb to the outer leaflet of anionic lipid bilayers through electrostatic interactions. We did not observe a direct correlation between GMT amphipathicity and affinity for lipid bilayers. Furthermore, GMT-lipid bilayer interactions did not correlate with potency or selectivity for Na V s. We therefore propose that increased membrane binding is unlikely to improve subtype selectivity and that the conserved amphipathic GMT surface profile is an adaptation that facilitates simultaneous modulation of multiple Na V s.


    Organizational Affiliation

    From the Institute for Molecular Bioscience, University of Queensland, Brisbane, Queensland 4072, Australia and c.schroeder@imb.uq.edu.au.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-theraphotoxin-Cm1bA34Ceratogyrus marshalliMutation(s): 1 
UniProt
Find proteins for P84508 (Ceratogyrus marshalli)
Explore P84508 
Go to UniProtKB:  P84508
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations 
  • OLDERADO: 6BTV Olderado

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Health and Medical Research Council (NHMRC, Australia)AustraliaAPP1080405

Revision History  (Full details and data files)

  • Version 1.0: 2018-05-09
    Type: Initial release
  • Version 1.1: 2018-05-16
    Changes: Data collection, Database references
  • Version 1.2: 2018-06-20
    Changes: Data collection, Database references
  • Version 1.3: 2020-01-08
    Changes: Author supporting evidence, Data collection