A mammalian transient type K+ channel, rat Kv1.4, has two potential domains that could produce rapid inactivation.

Abstract excerpt

The "ball and chain" model has been shown to be suitable for explaining the rapid inactivation of voltage-dependent K+ channels. For the Drosophila Shaker K+ channel (ShB), the first 20 residues of the amino terminus have been identified as the inactivation ball that binds to the open channel pore and blocks ion flow (Hoshi, T., Zagotta, W. N., and Aldrich, R. W. (1990) Science 250, 533-538; Zagotta, W. N.,...

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