2MI5

Structure of insect-specific sodium channel toxin mu-Dc1a


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: Best MolProbity score 

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Literature

A distinct sodium channel voltage-sensor locus determines insect selectivity of the spider toxin Dc1a.

Bende, N.S.Dziemborowicz, S.Mobli, M.Herzig, V.Gilchrist, J.Wagner, J.Nicholson, G.M.King, G.F.Bosmans, F.

(2014) Nat Commun 5: 4350-4350

  • DOI: 10.1038/ncomms5350
  • Primary Citation of Related Structures:  
    2MI5

  • PubMed Abstract: 
  • β-Diguetoxin-Dc1a (Dc1a) is a toxin from the desert bush spider Diguetia canities that incapacitates insects at concentrations that are non-toxic to mammals. Dc1a promotes opening of German cockroach voltage-gated sodium (Nav) channels (BgNav1), whereas human Nav channels are insensitive ...

    β-Diguetoxin-Dc1a (Dc1a) is a toxin from the desert bush spider Diguetia canities that incapacitates insects at concentrations that are non-toxic to mammals. Dc1a promotes opening of German cockroach voltage-gated sodium (Nav) channels (BgNav1), whereas human Nav channels are insensitive. Here, by transplanting commonly targeted S3b-S4 paddle motifs within BgNav1 voltage sensors into Kv2.1, we find that Dc1a interacts with the domain II voltage sensor. In contrast, Dc1a has little effect on sodium currents mediated by PaNav1 channels from the American cockroach even though their domain II paddle motifs are identical. When exploring regions responsible for PaNav1 resistance to Dc1a, we identified two residues within the BgNav1 domain II S1-S2 loop that when mutated to their PaNav1 counterparts drastically reduce toxin susceptibility. Overall, our results reveal a distinct region within insect Nav channels that helps determine Dc1a sensitivity, a concept that will be valuable for the design of insect-selective insecticides.


    Related Citations: 
    • Characterization and cloning of insecticidal peptides from the primitive weaving spider Diguetia canities.
      Krapcho, K.J., Kral, R.M., Vanwagenen, B.C., Eppler, K.G., Morgan, T.K.
      (1995) Insect Biochem Mol Biol 25: 991
    • Mode of action of an insecticidal peptide toxin from the venom of a weaving spider (Diguetia canities).
      Bloomquist, J.R., Kinne, L.P., Deutsch, V., Simpson, S.F.
      (1996) Toxicon 34: 1072

    Organizational Affiliation

    1] Department of Physiology, School of Medicine, Johns Hopkins University, Baltimore, Maryland 21205, USA [2] Solomon H. Snyder Department of Neuroscience, School of Medicine, Johns Hopkins University, Baltimore, Maryland 21205, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Mu-diguetoxin-Dc1aA57Diguetia canitiesMutation(s): 0 
UniProt
Find proteins for P49126 (Diguetia canities)
Explore P49126 
Go to UniProtKB:  P49126
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: Best MolProbity score 
  • OLDERADO: 2MI5 Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-07-23
    Type: Initial release