- EMDB-53244: Connexin-32 (Cx32) W3S mutant gap junction channel in POPC-contai... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-53244
タイトル
Connexin-32 (Cx32) W3S mutant gap junction channel in POPC-containing MSP2N2 nanodiscs
マップデータ
Postprocessed map of connexin-32 (Cx32) W3S mutant in POPC-containing MSP2N2 nanodiscs
試料
複合体: A dodecameric complex of connexin-32 (Cx32) W3S mutant gap junction channel
タンパク質・ペプチド: Gap junction beta-1 protein,Gap junction beta-1 protein,Green fluorescent protein
キーワード
Ion channel / gap junction / membrane transport / MEMBRANE PROTEIN
機能・相同性
機能・相同性情報
Oligomerization of connexins into connexons / Transport of connexins along the secretory pathway / gap junction assembly / connexin complex / Gap junction assembly / gap junction channel activity / 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: Nat Commun / 年: 2025 タイトル: Lipid dependence of connexin-32 gap junction channel conformations. 著者: Pia Lavriha / Carina Fluri / Jorge Enrique Hernández González / Volodymyr M Korkhov / 要旨: 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 ...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.