Ancillary protein that assembles as a beta subunit with a voltage-gated potassium channel complex of pore-forming alpha subunits. Modulates the gating kinetics and enhances stability of the channel complex. Assembled with KCNB1 modulates the gating characteristics of the delayed rectifier voltage-dependent potassium channel KCNB1. Associated with KCNH2/HERG is proposed to form the rapidly activating component of the delayed rectifying potassium current in heart (IKr). May associate with KCNQ2 and/or KCNQ3 and modulate the native M-type current. May associate with HCN1 and HCN2 and increase potassium current (By similarity). Interacts with KCNQ1; forms a heterooligomer complex leading to currents with an apparently instantaneous activation, a rapid deactivation process and a linear current-voltage relationship and decreases the amplitude of the outward current (By similarity).

Belongs to the potassium channel KCNE family.

123 amino acids

MATLANLTQTLEDAFKKIFITYMDSWRRNTTAEEQALQARVDAENFYYVILYLMVMIGMFSFIVVAILVSTVKSKRREHSQHPYHQYIVEDWQEKYKSQILHLEDSKATIHENMGATGFTVSP

14.4 kDa

(Note: Representative image - actual molecular weight may vary depending on tag type and expression method)

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