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Cell. 2001 Jan 26;104(2):217-31.

MiRP2 forms potassium channels in skeletal muscle with Kv3.4 and is associated with periodic paralysis.

Author information

  • 1Departments of Pediatrics and Cellular, Molecular Physiology, Boyer Center for Molecular Medicine, Yale University School of Medicine, New Haven, CT 06536, USA.

Abstract

The subthreshold, voltage-gated potassium channel of skeletal muscle is shown to contain MinK-related peptide 2 (MiRP2) and the pore-forming subunit Kv3.4. MiRP2-Kv3.4 channels differ from Kv3.4 channels in unitary conductance, voltage-dependent activation, recovery from inactivation, steady-state open probability, and block by a peptide toxin. Thus, MiRP2-Kv3.4 channels set resting membrane potential (RMP) and do not produce afterhyperpolarization or cumulative inactivation to limit action potential frequency. A missense mutation is identified in the gene for MiRP2 (KCNE3) in two families with periodic paralysis and found to segregate with the disease. Mutant MiRP2-Kv3.4 complexes exhibit reduced current density and diminished capacity to set RMP. Thus, MiRP2 operates with a classical potassium channel subunit to govern skeletal muscle function and pathophysiology.

PMID:
11207363
[PubMed - indexed for MEDLINE]
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