Cannabidiol inhibits both human KV7.1 and KV7.1/KCNE1 channels through distinct sitesShow others and affiliations
2026 (English)In: Acta Pharmacologica Sinica, ISSN 1671-4083, E-ISSN 1745-7254Article in journal (Refereed) Epub ahead of print
Abstract [en]
Several essential physiological systems express voltage-gated potassium channels within the KV7 family (comprising KV7.1–7.5), sometimes also co-assembled with auxiliary subunits in the KCNE family (comprising KCNE1–5). An ongoing challenge to KV7 drug development is creating subtype-selective compounds to limit adverse effects. Prior work has shown that the antiepileptic cannabidiol (CBD), a pan-KV7 modulator, inhibits cardiac- and epithelia-associated KV7.1 and KV7.1/KCNE1 channels, while activating neuronal KV7 subtypes (KV7.2–7.5). However, little is known about the binding sites through which CBD mediates inhibitory effects on KV7.1 and KV7.1/KCNE1, limiting insight towards the development of selective KV7 modulators. To address this knowledge gap, we used a combination of the Chai-1 artificial intelligence model (to generate CBD binding site predictions in human KV7.1 and KV7.1/KCNE1 channels), site-directed mutagenesis and electrophysiology of these channels expressed in Xenopus laevis oocytes (to corroborate CBD binding site predictions), and molecular dynamics simulations (to study the biophysical mechanisms underlying CBD binding). We found that CBD binds to two unique sites within KV7.1 and KV7.1/KCNE1. In KV7.1 alone, CBD was bound to an intrasubunit S5–S6 pore domain binding site; referred to as the S5–S6 site. In KV7.1/KCNE1, the addition of the KCNE1 subunit created a novel binding site for CBD, sandwiched between two KV7.1 subunits and one KCNE1 subunit; referred to here as the S6–S5’–E1 site. Molecular dynamics simulations showed that CBD binding to the S6–S5’–E1 KV7.1/KCNE1 site closes off the KV7.1 S5–S6 site. A sequence comparison between KV7 channels revealed key amino acid differences at both the S5–S6 and S6–S5’–E1 sites relative to neuronal KV7s. These support the notion that CBD binds differently in KV7.1 and KV7.1/KCNE1 channels in accordance with its unique inhibitory pharmacological effects on these channels compared to the activating effect in neuronal KV7s. Thus, we provide support for KV7.1 and KV7.1/KCNE1 being inhibited by CBD via distinct binding sites, which can guide future research focused on the rational development of drugs that avoid inhibitory effects on KV7.1 and KV7.1/KCNE1 channels or utilize these sites to modulate channel activity.
Place, publisher, year, edition, pages
Springer Nature , 2026.
Keywords [en]
binding site, cannabidiol, electrophysiology, KCNE1, KCNQ1, molecular modelling
National Category
Basic Medicine Structural Biology
Identifiers
URN: urn:nbn:se:kth:diva-378541DOI: 10.1038/s41401-025-01742-0ISI: 001705141200001PubMedID: 41776084Scopus ID: 2-s2.0-105032158460OAI: oai:DiVA.org:kth-378541DiVA, id: diva2:2048569
Note
QC 20260325
2026-03-252026-03-252026-03-25Bibliographically approved