Solution structure of scorpion Hottentotta jayakari venom toxin Hj1a

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 30 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

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Venom Peptides with Dual Modulatory Activity on the Voltage-Gated Sodium Channel NaV1.1 Provide Novel Leads for Development of Antiepileptic Drugs.

Chow, C.Y.Chin, Y.K.Walker, A.A.Guo, S.Blomster, L.V.Ward, M.J.Herzig, V.Rokyta, D.R.King, G.F.

(2020) Acs Pharmacol Transl Sci 3: 119-134

  • DOI: https://doi.org/10.1021/acsptsci.9b00079
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Voltage-gated sodium (Na V ) channels play a fundamental role in normal neurological function, especially via the initiation and propagation of action potentials. The Na V 1.1 subtype is found in inhibitory interneurons of the brain and it is essential for maintaining a balance between excitation and inhibition in neuronal networks. Heterozygous loss-of-function mutations of SCN1A , the gene encoding Na V 1.1, underlie Dravet syndrome (DS), a severe pediatric epilepsy. We recently demonstrated that selective inhibition of Na V 1.1 inactivation prevents seizures and premature death in a mouse model of DS. Thus, selective modulators of Na V 1.1 might be useful therapeutics for treatment of DS as they target the underlying molecular deficit. Numerous scorpion-venom peptides have been shown to modulate the activity of Na V channels, but little is known about their activity at Na V 1.1. Here we report the isolation, sequence, three-dimensional structure, recombinant production, and functional characterization of two peptidic modulators of Na V 1.1 from venom of the buthid scorpion Hottentotta jayakari . These peptides, Hj1a and Hj2a, are potent agonists of Na V 1.1 (EC 50 of 17 and 32 nM, respectively), and they present dual α/β activity by modifying both the activation and inactivation properties of the channel. NMR studies of rHj1a indicate that it adopts a cystine-stabilized αβ fold similar to known scorpion toxins. Although Hj1a and Hj2a have only limited selectivity for Na V 1.1, their unusual dual mode of action provides an alternative approach to the development of selective Na V 1.1 modulators for the treatment of DS.

  • Organizational Affiliation

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

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Venom toxin Hj1a67Hottentotta jayakariMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 30 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2020-02-12
    Type: Initial release
  • Version 1.1: 2020-04-22
    Changes: Database references
  • Version 1.2: 2023-06-14
    Changes: Database references, Other