7K48

Structure of NavAb/Nav1.7-VS2A chimera trapped in the resting state by tarantula toxin m3-Huwentoxin-IV


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural Basis for High-Affinity Trapping of the Na V 1.7 Channel in Its Resting State by Tarantula Toxin.

Wisedchaisri, G.Tonggu, L.Gamal El-Din, T.M.McCord, E.Zheng, N.Catterall, W.A.

(2021) Mol Cell 81: 38-48.e4

  • DOI: 10.1016/j.molcel.2020.10.039
  • Primary Citation of Related Structures:  
    7K48

  • PubMed Abstract: 
  • Voltage-gated sodium channels initiate electrical signals and are frequently targeted by deadly gating-modifier neurotoxins, including tarantula toxins, which trap the voltage sensor in its resting state. The structural basis for tarantula-toxin action remains elusive because of the difficulty of capturing the functionally relevant form of the toxin-channel complex ...

    Voltage-gated sodium channels initiate electrical signals and are frequently targeted by deadly gating-modifier neurotoxins, including tarantula toxins, which trap the voltage sensor in its resting state. The structural basis for tarantula-toxin action remains elusive because of the difficulty of capturing the functionally relevant form of the toxin-channel complex. Here, we engineered the model sodium channel Na V Ab with voltage-shifting mutations and the toxin-binding site of human Na V 1.7, an attractive pain target. This mutant chimera enabled us to determine the cryoelectron microscopy (cryo-EM) structure of the channel functionally arrested by tarantula toxin. Our structure reveals a high-affinity resting-state-specific toxin-channel interaction between a key lysine residue that serves as a "stinger" and penetrates a triad of carboxyl groups in the S3-S4 linker of the voltage sensor. By unveiling this high-affinity binding mode, our studies establish a high-resolution channel-docking and resting-state locking mechanism for huwentoxin-IV and provide guidance for developing future resting-state-targeted analgesic drugs.


    Organizational Affiliation

    Department of Pharmacology, University of Washington, Seattle, WA 98195, USA. Electronic address: wcatt@uw.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Maltose/maltodextrin-binding periplasmic protein,Ion transport protein,Sodium channel protein type 9 subunit alpha chimeraA, B, C, D611Escherichia coli K-12Aliarcobacter butzleri RM4018Homo sapiensMutation(s): 2 
Gene Names: malEb4034JW3994Abu_1752SCN9ANENA
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for A8EVM5 (Arcobacter butzleri (strain RM4018))
Explore A8EVM5 
Go to UniProtKB:  A8EVM5
Find proteins for P0AEX9 (Escherichia coli (strain K12))
Explore P0AEX9 
Go to UniProtKB:  P0AEX9
Find proteins for Q15858 (Homo sapiens)
Explore Q15858 
Go to UniProtKB:  Q15858
PHAROS:  Q15858
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Mu-theraphotoxin-Hs2aE, F, G, H35Haplopelma schmidtiMutation(s): 3 
Membrane Entity: Yes 
UniProt
Find proteins for P83303 (Cyriopagopus schmidti)
Explore P83303 
Go to UniProtKB:  P83303
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report




Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)United StatesR01 NS015751
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)United StatesR35 NS111573
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)United StatesR01 HL112808
Howard Hughes Medical Institute (HHMI)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2020-12-02
    Type: Initial release
  • Version 1.1: 2020-12-09
    Changes: Database references
  • Version 1.2: 2021-01-20
    Changes: Database references