Toxin and kinetic profile of rat brain type III sodium channels expressed in Xenopus oocytes.
Sodium (Na+) channels are members of a multigene family and are responsible for generation and propagation of the action potential in excitable cells. We have assembled, in a transcription-competent vector, a full-length cDNA clone encoding the rat brain type III Na+ channel. Xenopus oocytes microinjected with in vitro synthesized mRNA expressed functional rat brain Na+ channels from such 'cloned' RNA transcripts. We found that type III Na+ currents in whole cell microelectrode voltage clamp and in cell-attached patch recordings decayed much more slowly than any other reported Na+ current. In addition, we saw typical and additive effects of alpha- and beta-scorpion toxins, suggesting that the Na+ channel alpha-subunit itself contains functional and distinct toxin binding sites.
Duke Scholars
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- Xenopus laevis
- Sodium Channels
- Scorpion Venoms
- Rats, Inbred Strains
- Rats
- RNA, Messenger
- Oocytes
- Neurotoxins
- Neurology & Neurosurgery
- Molecular Sequence Data
Citation
Published In
DOI
ISSN
Publication Date
Volume
Issue
Start / End Page
Location
Related Subject Headings
- Xenopus laevis
- Sodium Channels
- Scorpion Venoms
- Rats, Inbred Strains
- Rats
- RNA, Messenger
- Oocytes
- Neurotoxins
- Neurology & Neurosurgery
- Molecular Sequence Data