Download MendeleyStructures of wild-type and selected CMT1X mutant connexin 32 gap junction channels and hemichannels.
Qi, C., Lavriha, P., Bayraktar, E., Vaithia, A., Schuster, D., Pannella, M., Sala, V., Picotti, P., Bortolozzi, M., Korkhov, V.M.(2023) Sci Adv 9: eadh4890-eadh4890
- PubMed: 37647412 Search on PubMedSearch on PubMed Central
- DOI: https://doi.org/10.1126/sciadv.adh4890
- Primary Citation Related Structures:
7ZXM, 7ZXN, 7ZXO, 7ZXP, 7ZXQ, 7ZXT - PubMed Abstract:
In myelinating Schwann cells, connection between myelin layers is mediated by gap junction channels (GJCs) formed by docked connexin 32 (Cx32) hemichannels (HCs). Mutations in Cx32 cause the X-linked Charcot-Marie-Tooth disease (CMT1X), a degenerative neuropathy without a cure. A molecular link between Cx32 dysfunction and CMT1X pathogenesis is still missing. Here, we describe the high-resolution cryo-electron cryo-myography (cryo-EM) structures of the Cx32 GJC and HC, along with two CMT1X-linked mutants, W3S and R22G. While the structures of wild-type and mutant GJCs are virtually identical, the HCs show a major difference: In the W3S and R22G mutant HCs, the amino-terminal gating helix partially occludes the pore, consistent with a diminished HC activity. Our results suggest that HC dysfunction may be involved in the pathogenesis of CMT1X.
- Institute of Molecular Biology and Biophysics, ETH Zurich, Zurich, Switzerland.
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