| First Author | Dover K | Year | 2010 |
| Journal | J Physiol | Volume | 588 |
| Issue | Pt 19 | Pages | 3695-711 |
| PubMed ID | 20679355 | Mgi Jnum | J:179549 |
| Mgi Id | MGI:5302631 | Doi | 10.1113/jphysiol.2010.192559 |
| Citation | Dover K, et al. (2010) Long-term inactivation particle for voltage-gated sodium channels. J Physiol 588(Pt 19):3695-711 |
| abstractText | Action potential generation is governed by the opening, inactivation, and recovery of voltage-gated sodium channels. A channel's voltage-sensing and pore-forming alpha subunit bears an intrinsic fast inactivation particle that mediates both onset of inactivation upon membrane depolarization and rapid recovery upon repolarization. We describe here a novel inactivation particle housed within an accessory channel subunit (A-type FHF protein) that mediates rapid-onset, long-term inactivation of several sodium channels. The channel-intrinsic and tethered FHF-derived particles, both situated at the cytoplasmic face of the plasma membrane, compete for induction of inactivation, causing channels to progressively accumulate into the long-term refractory state during multiple cycles of membrane depolarization. Intracellular injection of a short peptide corresponding to the FHF particle can reproduce channel long-term inactivation in a dose-dependent manner and can inhibit repetitive firing of cerebellar granule neurons. We discuss potential structural mechanisms of long-term inactivation and potential roles of A-type FHFs in the modulation of action potential generation and conduction. |
