Drosophila KCNQ channel displays evolutionarily conserved electrophysiology and pharmacology with mammalian KCNQ channels.
Drosophila KCNQ channel displays evolutionarily conserved electrophysiology and pharmacology with mammalian KCNQ channels.
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DOI:
10.1371/journal.pone.0023898
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发表时间:
2011
期刊:
影响因子:
3.7
通讯作者:
Hodge JJ
中科院分区:
文献类型:
--
作者:
Cavaliere S;Hodge JJ
Of the five human KCNQ (Kv7) channels, KCNQ1 with auxiliary subunit KCNE1 mediates the native cardiac IKs current with mutations causing short and long QT cardiac arrhythmias. KCNQ4 mutations cause deafness. KCNQ2/3 channels form the native M-current controlling excitability of most neurons, with mutations causing benign neonatal febrile convulsions. Drosophila contains a single KCNQ (dKCNQ) that appears to serve alone the functions of all the duplicated mammalian neuronal and cardiac KCNQ channels sharing roughly 50–60% amino acid identity therefore offering a route to investigate these channels. Current information about the functional properties of dKCNQ is lacking therefore we have investigated these properties here. Using whole cell patch clamp electrophysiology we compare the biophysical and pharmacological properties of dKCNQ with the mammalian neuronal and cardiac KCNQ channels expressed in HEK cells. We show that Drosophila KCNQ (dKCNQ) is a slowly activating and slowly-deactivating K+ current open at sub-threshold potentials that has similar properties to neuronal KCNQ2/3 with some features of the cardiac KCNQ1/KCNE1 accompanied by conserved sensitivity to a number of clinically relevant KCNQ blockers (chromanol 293B, XE991, linopirdine) and opener (zinc pyrithione). We also investigate the molecular basis of the differential selectivity of KCNQ channels to the opener retigabine and show a single amino acid substitution (M217W) can confer sensitivity to dKCNQ. We show dKCNQ has similar electrophysiological and pharmacological properties as the mammalian KCNQ channels, allowing future study of physiological and pathological roles of KCNQ in Drosophila and whole organism screening for new modulators of KCNQ channelopathies.
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DOI:
10.1038/nrd2983
发表时间:
2009-12
期刊:
Nature reviews. Drug discovery
影响因子:
--
作者:
通讯作者:
--
影响因子:
3.4
作者:
Pusch, M;Magrassi, R;Conti, F
通讯作者:
Conti, F
影响因子:
10.8
作者:
Bendahhou, S;Marionneau, C;Barhanin, J
通讯作者:
Barhanin, J
DOI:
10.1073/pnas.0609278104
发表时间:
2007-03-06
影响因子:
11.1
作者:
Ocorr, Karen;Reeves, Nick L.;Bodmer, Rolf
通讯作者:
Bodmer, Rolf
影响因子:
3.9
作者:
Van Eyken, E.;Van Laer, L.;Van Camp, G.
通讯作者:
Van Camp, G.