KCa3.1 | IK | SK4 | Intermediate Conductance Calcium-activated Potassium Channel Protein 4

Calcium-activated Potassium channels

Today, eight  human calcium-activated channels are known: KCa1.1 (also known as BK or Maxi-K), KCa2.1 (also known as SK1), KCa2.2 (also known as SK2), KCa2.3 (also known as SK3) , KCa3.1 (also known as IK or SK4), KCa4.1, KCa4.2, KCa5.1

KCa channels are made up of two different subunits, alpha and beta. The alpha subunit contains six or seven trans-membrane regions and forms homo- or heter-tetramers. The beta subunit has a regulative function and contains 2 trans-membrane regions.

This family of ion channels is, for the most part, activated by intracellular Ca2+. However, some of these channels (the KCa4 and KCa5 channels) are responsive instead to other intracellular ligands, such as Na+, Cl, and pH. Furthermore, multiple members of family are both ligand and voltage activated.

Data and Applications

KCa3.1 (SK4) - Activation by Perfusion of free internal Calcium

180209 Data PE SK4icon sp96   SyncroPatch 384/768 PE data and applications:
Cells were kindly provided by Charles River.

Screenshots of the PatchControl 384 software are showing KCa3.1 raw traces and according time plots (online analysis) to a voltage ramp from -120 mV to + 60 mV over 200 ms. The application of internal Ca2+ is indicated by the yellow bar. The current increased upon application of internal Ca2+ reaching a peak within 1-2 min after the start of the perfusion. Five minutes of stable KCa3.1 current was recorded prior the channel was inhibited by cumulative additions of external Ba2+; first partly (1 mM Ba2+) and then completely (5 mM Ba2+). The recording was performed with perfectly high success rates in whole cell configuration on a multi hole chip (4 holes per well) using the SyncroPatch 384PE.

Application Notes

KCa3.1 - "Modulation of hKCa3.1 by internal Ca2+ performed on Nanion’s Patchliner"

icon pl   Patchliner application note:   logo pdf   (0.6 MB)
Cells were kindly provided by Charles River.



27.06.2017 | Webinar: New Dynamics in Automated Patch Clamp

icon pl   Patchliner

This webinar shows new applications on dynamic patch clamp of iPSC-derived cardiomyocytes and introduces an assay on KCa3.1 expressed in erythrocytes



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