- EMDB-18291: Cryo-EM structure of Cx26 solubilised in LMNG - hemichannel class... -
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基本情報
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データベース: EMDB / ID: EMD-18291
タイトル
Cryo-EM structure of Cx26 solubilised in LMNG - hemichannel classification - NConst conformation
マップデータ
Full map locally sharpened in phenix; classification and masked refinement over A-F hemichannel
試料
複合体: Connexin 26, 90mmHg PCO2, pH7.4, solubilised in LMNG.
タンパク質・ペプチド: Gap junction beta-2 protein
リガンド: PHOSPHATIDYLETHANOLAMINE
リガンド: water
キーワード
Gap junction Large Pore Channel Carbon dioxide sensitive / MEMBRANE PROTEIN
機能・相同性
機能・相同性情報
Transport of connexons to the plasma membrane / response to human chorionic gonadotropin / gap junction-mediated intercellular transport / epididymis development / gap junction channel activity involved in cell communication by electrical coupling / Oligomerization of connexins into connexons / Transport of connexins along the secretory pathway / gap junction assembly / connexin complex / gap junction ...Transport of connexons to the plasma membrane / response to human chorionic gonadotropin / gap junction-mediated intercellular transport / epididymis development / gap junction channel activity involved in cell communication by electrical coupling / Oligomerization of connexins into connexons / Transport of connexins along the secretory pathway / gap junction assembly / connexin complex / gap junction / Gap junction assembly / gap junction channel activity / astrocyte projection / cellular response to glucagon stimulus / inner ear development / decidualization / endoplasmic reticulum-Golgi intermediate compartment / lateral plasma membrane / response to retinoic acid / cellular response to dexamethasone stimulus / response to ischemia / response to progesterone / sensory perception of sound / transmembrane transport / response to estradiol / cell-cell signaling / cellular response to oxidative stress / cell body / response to lipopolysaccharide / calcium ion binding / perinuclear region of cytoplasm / identical protein binding / plasma membrane 類似検索 - 分子機能
Gap junction beta-2 protein (Cx26) / 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: Elife / 年: 2024 タイトル: Structures of wild-type and a constitutively closed mutant of connexin26 shed light on channel regulation by CO. 著者: Deborah H Brotherton / Sarbjit Nijjar / Christos G Savva / Nicholas Dale / Alexander David Cameron / 要旨: Connexins allow intercellular communication by forming gap junction channels (GJCs) between juxtaposed cells. Connexin26 (Cx26) can be regulated directly by CO. This is proposed to be mediated ...Connexins allow intercellular communication by forming gap junction channels (GJCs) between juxtaposed cells. Connexin26 (Cx26) can be regulated directly by CO. This is proposed to be mediated through carbamylation of K125. We show that mutating K125 to glutamate, mimicking the negative charge of carbamylation, causes Cx26 GJCs to be constitutively closed. Through cryo-EM we observe that the K125E mutation pushes a conformational equilibrium towards the channel having a constricted pore entrance, similar to effects seen on raising the partial pressure of CO. In previous structures of connexins, the cytoplasmic loop, important in regulation and where K125 is located, is disordered. Through further cryo-EM studies we trap distinct states of Cx26 and observe density for the cytoplasmic loop. The interplay between the position of this loop, the conformations of the transmembrane helices and the position of the N-terminal helix, which controls the aperture to the pore, provides a mechanism for regulation.
詳細: The buffer, except LMNG and DTT, was prepared fresh from 10x stock on day of used. The basal buffer was filtered and degassed and DDM and DTT added. The buffer was pH corrected at point of ...詳細: The buffer, except LMNG and DTT, was prepared fresh from 10x stock on day of used. The basal buffer was filtered and degassed and DDM and DTT added. The buffer was pH corrected at point of use to pH 7.4 using 15% CO2 in 85% N2.