Abstract：
:We describe the isolation and characterization of a cDNA encoding the alpha subunit of a new voltage-sensitive sodium channel, microI, from rat skeletal muscle. The 1840 amino acid microI peptide is homologous to alpha subunits from rat brain, but, like the protein from eel electroplax, lacks an extended (approximately 200) amino acid segment between homologous domains I and II. Northern blot analysis indicates that the 8.5 kb microI transcript is preferentially expressed in skeletal muscle. Sodium channels expressed in Xenopus oocytes from synthetic RNA encoding microI are blocked by tetrodotoxin and mu-conotoxin at concentrations near 5 nM. The expressed sodium channels have gating kinetics similar to the native channels in rat muscle fibers, except that inactivation occurs more slowly.
journal_name
Neuronjournal_title
Neuronauthors
Trimmer JS,Cooperman SS,Tomiko SA,Zhou JY,Crean SM,Boyle MB,Kallen RG,Sheng ZH,Barchi RL,Sigworth FJdoi
10.1016/0896-6273(89)90113-xsubject
Has Abstract,Author List Incompletepub_date
1989-07-01 00:00:00pages
33-49issue
1eissn
0896-6273issn
1097-4199pii
0896-6273(89)90113-Xjournal_volume
3pub_type
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