- EMDB-18447: Connexin-32 gap junction channel in complex with mefloquine -
+
データを開く
IDまたはキーワード:
読み込み中...
-
基本情報
登録情報
データベース: EMDB / ID: EMD-18447
タイトル
Connexin-32 gap junction channel in complex with mefloquine
マップデータ
試料
複合体: Connexin-32 gap junction channel in complex with 2-aminoethoxydipheniyl borate
タンパク質・ペプチド: Gap junction beta-1 protein
キーワード
complex / 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 channel activity / Gap junction assembly / lateral plasma membrane / nervous system development ...purine ribonucleotide transport / epididymis development / Oligomerization of connexins into connexons / Transport of connexins along the secretory pathway / gap junction assembly / connexin complex / gap junction channel activity / Gap junction assembly / lateral plasma membrane / nervous system development / cell-cell signaling / 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: PLoS One / 年: 2024 タイトル: Mechanism of connexin channel inhibition by mefloquine and 2-aminoethoxydiphenyl borate. 著者: Pia Lavriha / Yufei Han / Xinyue Ding / Dina Schuster / Chao Qi / Anand Vaithia / Paola Picotti / Volodymyr M Korkhov / 要旨: Gap junction intercellular communication (GJIC) between two adjacent cells involves direct exchange of cytosolic ions and small molecules via connexin gap junction channels (GJCs). Connexin GJCs have ...Gap junction intercellular communication (GJIC) between two adjacent cells involves direct exchange of cytosolic ions and small molecules via connexin gap junction channels (GJCs). Connexin GJCs have emerged as drug targets, with small molecule connexin inhibitors considered a viable therapeutic strategy in several diseases. The molecular mechanisms of GJC inhibition by known small molecule connexin inhibitors remain unknown, preventing the development of more potent and connexin-specific therapeutics. Here we show that two GJC inhibitors, mefloquine (MFQ) and 2-aminoethoxydiphenyl borate (2APB) bind to Cx32 and block dye permeation across Cx32 hemichannels (HCs) and GJCs. Cryo-EM analysis shows that 2APB binds to "site A", close to the N-terminal gating helix of Cx32 GJC, restricting the entrance to the channel pore. In contrast, MFQ binds to a distinct "site M", deeply buried within the pore. MFQ binding to this site modifies the electrostatic properties of Cx32 pore. Mutagenesis of V37, a key residue located in the site M, renders Cx32 HCs and GJCs insensitive to MFQ-mediated inhibition. Moreover, our cryo-EM analysis, mutagenesis and activity assays show that MFQ targets the M site in Cx43 GJC similarly to Cx32. Taken together, our results point to a conserved inhibitor binding site in connexin channels, opening a new route for development of specific drugs targeting connexins.