Movements near the gate of a hyperpolarization-activated cation channel.

Abstract excerpt

Hyperpolarization-activated cation (HCN) channels regulate pacemaking activity in cardiac cells and neurons. Like the related depolarization-activated K+ channels (Kv channels), HCN channels use an intracellular activation gate to regulate access to an inner cavity, lined by the S6 transmembrane regions, which leads to the selectivity filter near the extracellular surface. Here we describe two types of metal...

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