A conserved mechanism of LRRC8 channel inhibition by two structurally distinct drugs.

ABSTRACT: Leucine Rich Repeat Containing 8 (LRRC8) anion channels are emerging therapeutic targets, but their pharmacology is poorly developed. We employed a structurally defined homomeric channel chimera (8C-8A(IL1²⁵)) and heteromeric LRRC8A/LRRC8C (8A/8C) channels to investigate the mechanism of action of two structurally distinct LRRC8 inhibitors: zafirlukast and pranlukast. Molecular dynamics simulations identified zafirlukast binding sites in 8C-8A(IL1²⁵) comprising the amino (N)-terminal domain (NTD) and inter-subunit fenestrae between transmembrane (TM) helices 1 and 2. Pranlukast also clusters in fenestrae albeit closer to the external pore. Patch clamp analysis revealed that mutations in NTD, TM1, and TM2 alter 8C-8A(IL1²⁵) and 8A/8C sensitivity to zafirluka

SUBMITTER: Yamada T 

PROVIDER: S-EPMC12501385 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature