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Toxicon. 2007 Feb;49(2):213-30. Epub 2006 Sep 29.

Tarantula toxins interacting with voltage sensors in potassium channels.

Author information

1
Molecular Physiology and Biophysics Section, Porter Neuroscience Research Center, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892, USA. swartzk@ninds.nih.gov

Abstract

Voltage-activated ion channels open and close in response to changes in membrane voltage, a process that is crucial for electrical signaling in the nervous system. The venom from many poisonous creatures contains a diverse array of small protein toxins that bind to voltage-activated channels and modify the gating mechanism. Hanatoxin and a growing number of related tarantula toxins have been shown to inhibit activation of voltage-activated potassium (K(v)) channels by interacting with their voltage-sensing domains. This review summarizes our current understanding of the mechanism by which these toxins alter gating, the location of the toxin receptor within K(v) channels and the disposition of this receptor with respect to the lipid membrane. The conservation of tarantula toxin receptors among voltage-activated ion channels will also be discussed.

PMID:
17097703
PMCID:
PMC1839852
DOI:
10.1016/j.toxicon.2006.09.024
[Indexed for MEDLINE]
Free PMC Article
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