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HERG potassium channel regulation by the N-terminal eag domain.
Ahleah S Gustina; Matthew C Trudeau (Profiled Author: Matthew C Trudeau)
Program in Neuroscience, University of Maryland School of Medicine, Baltimore, MD 21201, United States.
Cellular signalling 2012;24(8):1592-8.
Human ether-á-go-go related gene (hERG, K(v)11.1) potassium channels play a significant role in cardiac excitability. Like other K(v) channels, hERG is activated by membrane voltage; however, distinct from other K(v) channels, hERG channels have unusually slow kinetics of closing (deactivation). The mechanism for slow deactivation involves an N-terminal "eag domain" which comprises a PAS (Per-Arnt-Sim) domain and a short Cap domain. Here we review recent advances in understanding how the eag domain regulates deactivation, including several new Nuclear Magnetic Resonance (NMR) solution structures of the eag domain, and evidence showing that the eag domain makes a direct interaction with the C-terminal C-linker and Cyclic Nucleotide-Binding Homology Domain.
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