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Electrophysiological characterization of a new member of the RCK family of rat brain K + channels
Author(s) -
Glenn E. Kirsch,
John Drewe,
Sumita Verma,
Arthur M. Brown,
Rolf H. Joho
Publication year - 1991
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(91)80082-e
Subject(s) - charybdotoxin , electrophysiology , xenopus , 4 aminopyridine , chemistry , potassium channel , biophysics , conductance , potassium channel blocker , tetraethylammonium , inward rectifier potassium ion channel , ion channel , biochemistry , neuroscience , biology , potassium , physics , gene , receptor , organic chemistry , condensed matter physics
A novel member of the RCK family of rat brain K + channels, called RCK2, has been sequenced and expressed in Xenopus oocytes. The K + currents were voltage‐dependent, activated within 20 ms (at 0 mV), did not inactivate in 5 s, and had a single channel conductance in frog Ringers of 8.2 pS. Compared to other members of the RCK family the pharmacological profile of RCK2 was unique in that the channel was resistant to block (IC 50 = 3.3 μM) by charybdotoxin [(1988) Proc. Natl. Acad. Sci. USA 85, 3329–3333] but relatively sensitive to 4‐aminopyridine (0.3 mM), tetraethylammonium (1.7 mM), α‐dendrotoxin (25 nM), noxiustoxin (200 nM), and mast cell degranulating peptide (200 nM). Thus, RCK2 is a non‐inactivating delayed rectifier K + channel with interesting pharmacological properties.