TY - JOUR TI - KCNE1 tunes the sensitivity of KV7.1 to polyunsaturated fatty acids by moving turret residues close to the binding site AU - Larsson, Johan E AU - Larsson, H Peter AU - Liin, Sara I A2 - Csanády, László A2 - Aldrich, Richard VL - 7 PY - 2018 DA - 2018/07/17 SP - e37257 C1 - eLife 2018;7:e37257 DO - 10.7554/eLife.37257 UR - https://doi.org/10.7554/eLife.37257 AB - The voltage-gated potassium channel KV7.1 and the auxiliary subunit KCNE1 together form the cardiac IKs channel, which is a proposed target for future anti-arrhythmic drugs. We previously showed that polyunsaturated fatty acids (PUFAs) activate KV7.1 via an electrostatic mechanism. The activating effect was abolished when KV7.1 was co-expressed with KCNE1, as KCNE1 renders PUFAs ineffective by promoting PUFA protonation. PUFA protonation reduces the potential of PUFAs as anti-arrhythmic compounds. It is unknown how KCNE1 promotes PUFA protonation. Here, we found that neutralization of negatively charged residues in the S5-P-helix loop of KV7.1 restored PUFA effects on KV7.1 co-expressed with KCNE1 in Xenopus oocytes. We propose that KCNE1 moves the S5-P-helix loop of KV7.1 towards the PUFA-binding site, which indirectly causes PUFA protonation, thereby reducing the effect of PUFAs on KV7.1. This mechanistic understanding of how KCNE1 alters KV7.1 pharmacology is essential for development of drugs targeting the IKs channel. KW - KCNQ1 KW - protonation KW - two-electrode voltage clamp KW - IKs JF - eLife SN - 2050-084X PB - eLife Sciences Publications, Ltd ER -