5TLR

Solution NMR structure of gHwTx-IV

  • Classification: TOXIN
  • Organism(s): Cyriopagopus schmidti
  • Mutation(s): 

  • Deposited: 2016-10-11 Released: 2017-02-22 
  • Deposition Author(s): Agwa, A.J., Schroeder, C.I.
  • Funding Organization(s): National Health and Medical Research Council (Australia) 

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: all calculated structures submitted 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Spider peptide toxin HwTx-IV engineered to bind to lipid membranes has an increased inhibitory potency at human voltage-gated sodium channel hNaV1.7.

Agwa, A.J.Lawrence, N.Deplazes, E.Cheneval, O.Chen, R.M.Craik, D.J.Schroeder, C.I.Henriques, S.T.

(2017) Biochim. Biophys. Acta 1859: 835-844

  • DOI: 10.1016/j.bbamem.2017.01.020

  • PubMed Abstract: 
  • The human voltage-gated sodium channel sub-type 1.7 (hNaV1.7) is emerging as an attractive target for the development of potent and sub-type selective novel analgesics with increased potency and fewer side effects than existing therapeutics. HwTx-IV, ...

    The human voltage-gated sodium channel sub-type 1.7 (hNaV1.7) is emerging as an attractive target for the development of potent and sub-type selective novel analgesics with increased potency and fewer side effects than existing therapeutics. HwTx-IV, a spider derived peptide toxin, inhibits hNaV1.7 with high potency and is therefore of great interest as an analgesic lead. In the current study we examined whether engineering a HwTx-IV analogue with increased ability to bind to lipid membranes would improve its inhibitory potency at hNaV1.7. This hypothesis was explored by comparing HwTx-IV and two analogues [E1PyrE]HwTx-IV (mHwTx-IV) and [E1G,E4G,F6W,Y30W]HwTx-IV (gHwTx-IV) on their membrane-binding affinity and hNaV1.7 inhibitory potency using a range of biophysical techniques including computational analysis, NMR spectroscopy, surface plasmon resonance, and fluorescence spectroscopy. HwTx-IV and mHwTx-IV exhibited weak affinity for lipid membranes, whereas gHwTx-IV showed improved affinity for the model membranes studied. In addition, activity assays using SH-SY5Y neuroblastoma cells expressing hNaV1.7 showed that gHwTx-IV has increased activity at hNaV1.7 compared to HwTx-IV. Based on these results we hypothesize that an increase in the affinity of HwTx-IV for lipid membranes is accompanied by improved inhibitory potency at hNaV1.7 and that increasing the affinity of gating modifier toxins to lipid bilayers is a strategy that may be useful for improving their potency at hNaV1.7.


    Organizational Affiliation

    Institute for Molecular Bioscience, The University of Queensland, Qld 4072, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Mu-theraphotoxin-Hs2a
A
36Cyriopagopus schmidtiMutation(s): 3 
Find proteins for P83303 (Cyriopagopus schmidti)
Go to UniProtKB:  P83303
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
NH2
Query on NH2
A
NON-POLYMERH2 N

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Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: all calculated structures submitted 
Software Package:
Software NamePurpose
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


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

Revision History 

  • Version 1.0: 2017-02-22
    Type: Initial release
  • Version 1.1: 2017-03-01
    Type: Database references
  • Version 1.2: 2017-09-27
    Type: Author supporting evidence, Structure summary