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The effects of metal cations on the activation of recombinant human SK4 (also known as hIK1 or hKCa4) channels, expressed in HEK 293 cells, were tested using patch clamp recording. Of the nine metals tested, cobalt, iron, magnesium, and zinc did not activate the SK4 channels when applied, at concentrations up to 100 μM, to the inside of SK4 channel-expressing membrane patches. Barium, cadmium, calcium,...
Voltage-dependent human ether à go-go (hEAG1) potassium channels are implicated in neuronal signaling as well as in cancer cell proliferation. Unique sensitivity of the channel to intracellular Ca 2+ is mediated by calmodulin (CaM) binding to the intracellular N- and C-termini of the channel. Here we show that application of the acidic calcium-binding protein S100B to inside-out patches of...
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