cryo-EM structure of Connexin 32 R22G mutation hemi channel
マップデータ
試料
複合体: Connexin32 R22G hemi channel complex
タンパク質・ペプチド: Gap junction beta-1 protein
キーワード
connexin / gap junction channel / cell communication / MEMBRANE PROTEIN
機能・相同性
機能・相同性情報
purine ribonucleotide transport / epididymis development / Oligomerization of connexins into connexons / Transport of connexins along the secretory pathway / gap junction assembly / connexin complex / Gap junction assembly / gap junction channel activity / lateral plasma membrane / cell-cell signaling ...purine ribonucleotide transport / epididymis development / Oligomerization of connexins into connexons / Transport of connexins along the secretory pathway / gap junction assembly / connexin complex / Gap junction assembly / gap junction channel activity / lateral plasma membrane / cell-cell signaling / nervous system development / endoplasmic reticulum membrane / identical protein binding 類似検索 - 分子機能
Gap junction beta-1 protein (Cx32) / Connexin / Connexin, N-terminal / Connexin, conserved site / Gap junction protein, cysteine-rich domain / Connexin, N-terminal domain superfamily / Connexin / Connexins signature 1. / Connexins signature 2. / Connexin homologues / Gap junction channel protein cysteine-rich domain 類似検索 - ドメイン・相同性
ジャーナル: Sci Adv / 年: 2023 タイトル: Structures of wild-type and selected CMT1X mutant connexin 32 gap junction channels and hemichannels. 著者: Chao Qi / Pia Lavriha / Erva Bayraktar / Anand Vaithia / Dina Schuster / Micaela Pannella / Valentina Sala / Paola Picotti / Mario Bortolozzi / Volodymyr M Korkhov / 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.