KCNE1 tunes the sensitivity of KV7.1 to polyunsaturated fatty acids by moving turret residues close to the binding site
Abstract
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.
Data availability
All data generated or analysed during this study are included in the manuscript and supporting files (Supplementary File 1).
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Funding
National Institutes of Health (R01GM109762)
- H Peter Larsson
Svenska Sällskapet för Medicinsk Forskning
- Sara I Liin
Vetenskapsrådet
- Sara I Liin
Linköpings Universitet
- Sara I Liin
The County Council of Östergötland
- Sara I Liin
The Lions Foundation
- Sara I Liin
National Institutes of Health (R01HL131461)
- H Peter Larsson
The funders had no role in study design, data collection and interpretation, or the decision to submit the work for publication.
Ethics
Animal experimentation: Animal experiments were performed in strict accordance with the recommendation of The Linköping Animal Ethics Committee at Linköping University (protocol #53-13 ).
Copyright
© 2018, Larsson et al.
This article is distributed under the terms of the Creative Commons Attribution License permitting unrestricted use and redistribution provided that the original author and source are credited.
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