منابع مشابه
Inactivation of voltage-gated cardiac K+ channels.
Inactivation is the process by which an open channel enters a stable nonconducting conformation after a depolarizing change in membrane potential. Inactivation is a widespread property of many different types of voltage-gated ion channels. Recent advances in the molecular biology of K+ channels have elucidated two mechanistically distinct types of inactivation, N-type and C-type. N-type inactiv...
متن کاملFast Inactivation in Shaker K+ Channels
Fast inactivating Shaker H4 potassium channels and nonconducting pore mutant Shaker H4 W434F channels have been used to correlate the installation and recovery of the fast inactivation of ionic current with changes in the kinetics of gating current known as "charge immobilization" (Armstrong, C.M., and F. Bezanilla. 1977. J. Gen. Physiol. 70:567-590.). Shaker H4 W434F gating currents are very s...
متن کاملCooperative subunit interactions in C-type inactivation of K channels.
C-type inactivation of potassium channels is distinct from N-terminal mediated (N-type) inactivation and involves a closing of the outer mouth of the channel. We have investigated the role of the individual subunits of the tetrameric channel in the C-type inactivation conformational change by comparing the inactivation rates of channels constructed from different combinations of subunits. The r...
متن کاملEnergetics of Shaker K channels block by inactivation peptides
A synthetic peptide of the NH2-terminal inactivation domain of the ShB channel blocks Shaker channels which have an NH2-terminal deletion and mimics many of the characteristics of the intramolecular inactivation reaction. To investigate the role of electrostatic interactions in both peptide block and the inactivation process we measured the kinetics of block of macroscopic currents recorded fro...
متن کاملDeactivation retards recovery from inactivation in Shaker K+ channels.
In Na+ channels, recovery from inactivation begins with a delay, followed by an exponential course, and hyperpolarization shortens the delay as well as hastens the entire exponential phase. These findings have been taken to indicate that Na+ channels must deactivate to recover from inactivation, and deactivation facilitates the unbinding of the inactivating particle. In contrast, it is demonstr...
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ژورنال
عنوان ژورنال: Japanese Journal of Pharmacology
سال: 1995
ISSN: 0021-5198
DOI: 10.1016/s0021-5198(19)46224-0