Download MendeleyLipid dependence of connexin-32 gap junction channel conformations.
Lavriha, P., Fluri, C., Hernandez Gonzalez, J.E., Korkhov, V.M.(2025) Nat Commun
- PubMed: 41350533
- DOI: https://doi.org/10.1038/s41467-025-67004-z
- Primary Citation of Related Structures:
9QN9, 9QND, 9QNF, 9QNT - PubMed Abstract:
Connexin-32 (Cx32) gap junction channels (GJCs) mediate intercellular coupling in various tissues, including myelinating Schwann cells. Mutations in Cx32, such as W3S, are associated with X-linked Charcot-Marie-Tooth (CMT1X) disease. Lipids regulate Cx32 GJC permeation, although the regulatory mechanism is unclear. Here, we determine the cryo-EM structures of Cx32 GJCs reconstituted in nanodiscs, revealing that phospholipids block the Cx32 GJC pore by binding to the site formed by N-terminal gating helices. The phospholipid-bound state is contingent on the presence of a sterol molecule in a hydrophobic pocket formed by the N-terminus: the N-terminal helix of Cx32 fails to sustain a phospholipid binding site in the absence of cholesterol hemisuccinate. The CMT1X-linked W3S mutant which has an impaired sterol binding site adopts a conformation of the N-terminus incompatible with phospholipid binding. Our results indicate that different lipid species control connexin channel gating directly by influencing the conformation of the N-terminal gating helix.
- Laboratory of Biomolecular Research, Paul Scherrer Institute, Villigen, Switzerland.
Organizational Affiliation:
