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-Structure paper
タイトル | Structures of wild-type and selected CMT1X mutant connexin 32 gap junction channels and hemichannels. |
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ジャーナル・号・ページ | Sci Adv, Vol. 9, Issue 35, Page eadh4890, Year 2023 |
掲載日 | 2023年8月30日 |
著者 | Chao Qi / Pia Lavriha / Erva Bayraktar / Anand Vaithia / Dina Schuster / Micaela Pannella / Valentina Sala / Paola Picotti / Mario Bortolozzi / Volodymyr M Korkhov / |
PubMed 要旨 | 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 ...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. |
リンク | Sci Adv / PubMed:37647412 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 2.14 - 3.53 Å |
構造データ | EMDB-15010, PDB-7zxm: EMDB-15011, PDB-7zxn: EMDB-15012, PDB-7zxo: EMDB-15013, PDB-7zxp: EMDB-15014, PDB-7zxq: EMDB-15016, PDB-7zxt: |
化合物 | ChemComp-CLR: |
由来 |
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キーワード | MEMBRANE PROTEIN / connexin / gap junction channel / cell communication / Hemi channel |