6MK5

Solution NMR structure of spider toxin analogue [F5A,M6F,T26L,K28R]GpTx-1

  • Classification: TOXIN
  • Organism(s): Grammostola porteri
  • Mutation(s): Yes 

  • Deposited: 2018-09-25 Released: 2018-12-19 
  • Deposition Author(s): Schroeder, C.I.
  • Funding Organization(s): National Health and Medical Research Council (NHMRC, Australia), 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

Peptide-Membrane Interactions Affect the Inhibitory Potency and Selectivity of Spider Toxins ProTx-II and GpTx-1.

Lawrence, N.Wu, B.Ligutti, J.Cheneval, O.Agwa, A.J.Benfield, A.H.Biswas, K.Craik, D.J.Miranda, L.P.Henriques, S.T.Schroeder, C.I.

(2019) ACS Chem Biol 14: 118-130

  • DOI: 10.1021/acschembio.8b00989
  • Primary Citation of Related Structures:  
    6MK5, 6MK4

  • PubMed Abstract: 
  • Gating modifier toxins (GMTs) from spider venom can inhibit voltage gated sodium channels (Na V s) involved in pain signal transmission, including the Na V 1.7 subtype. GMTs have a conserved amphipathic structure that allow them to interact with membranes and also with charged residues in regions of Na V that are exposed at the cell surface ...

    Gating modifier toxins (GMTs) from spider venom can inhibit voltage gated sodium channels (Na V s) involved in pain signal transmission, including the Na V 1.7 subtype. GMTs have a conserved amphipathic structure that allow them to interact with membranes and also with charged residues in regions of Na V that are exposed at the cell surface. ProTx-II and GpTx-1 are GMTs able to inhibit Na V 1.7 with high potency, but they differ in their ability to bind to membranes and in their selectivity over other Na V subtypes. To explore these differences and gain detailed information on their membrane-binding ability and how this relates to potency and selectivity, we examined previously described Na V 1.7 potent/selective GpTx-1 analogues and new ProTx-II analogues designed to reduce membrane binding and improve selectivity for Na V 1.7. Our studies reveal that the number and type of hydrophobic residues as well as how they are presented at the surface determine the affinity of ProTx-II and GpTx-1 for membranes and that altering these residues can have dramatic effects on Na V inhibitory activity. We demonstrate that strong peptide-membrane interactions are not essential for inhibiting Na V 1.7 and propose that hydrophobic interactions instead play an important role in positioning the GMT at the membrane surface proximal to exposed Na V residues, thereby affecting peptide-channel interactions. Our detailed structure-activity relationship study highlights the challenges of designing GMT-based molecules that simultaneously achieve high potency and selectivity for Na V 1.7, as single mutations can induce local changes in GMT structure that can have a major impact on Na V -inhibitory activity.


    Organizational Affiliation

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



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Toxin GTx1-15A34Grammostola porteriMutation(s): 4 
UniProt
Find proteins for P0DL72 (Grammostola porteri)
Explore P0DL72 
Go to UniProtKB:  P0DL72
Protein Feature View
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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 lowest energy 
  • OLDERADO: 6MK5 Olderado

Structure Validation

View Full Validation Report




Entry History & Funding Information

Deposition Data

  • Deposited Date: 2018-09-25 
  • Released Date: 2018-12-19 
  • Deposition Author(s): Schroeder, C.I.

Funding OrganizationLocationGrant Number
National Health and Medical Research Council (NHMRC, Australia)AustraliaAPP1080405
Australian Research Council (ARC)AustraliaFT160100055
Australian Research Council (ARC)AustraliaFT150100398
Australian Research Council (ARC)AustraliaFL150100146

Revision History  (Full details and data files)

  • Version 1.0: 2018-12-19
    Type: Initial release
  • Version 1.1: 2019-04-03
    Changes: Data collection, Database references
  • Version 1.2: 2020-01-01
    Changes: Author supporting evidence, Data collection