- EMDB-18297: Cryo-EM reconstruction of Cx26 gap junction WT in HEPES buffer -
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基本情報
登録情報
データベース: EMDB / ID: EMD-18297
タイトル
Cryo-EM reconstruction of Cx26 gap junction WT in HEPES buffer
マップデータ
Full map D6 averaged (unsharpened)
試料
複合体: Connexin 26 WT in HEPES buffer pH 8.0
タンパク質・ペプチド: Connexin 26
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 / gap junction channel activity involved in cell communication by electrical coupling / epididymis development / 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 / gap junction channel activity involved in cell communication by electrical coupling / epididymis development / Oligomerization of connexins into connexons / Transport of connexins along the secretory pathway / gap junction assembly / connexin complex / gap junction / gap junction channel activity / astrocyte projection / Gap junction assembly / endoplasmic reticulum-Golgi intermediate compartment / inner ear development / decidualization / lateral plasma membrane / response to retinoic acid / cellular response to glucagon stimulus / cellular response to dexamethasone stimulus / response to progesterone / response to ischemia / sensory perception of sound / transmembrane transport / cell-cell signaling / response to estradiol / cell body / cellular response to oxidative stress / 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 DDM and DTT, was prepared fresh from 10x stock on day of used. The basal buffer was filtered and degassed and DDM and DTT added.
凍結
凍結剤: ETHANE-PROPANE / 装置: LEICA EM GP 詳細: 3 microlitres protein applied to grid, blot time 3 seconds.
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電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
特殊光学系
位相板: VOLTA PHASE PLATE / エネルギーフィルター - 名称: GIF Bioquantum
撮影
フィルム・検出器のモデル: FEI FALCON III (4k x 4k) 検出モード: COUNTING / 実像数: 2436 / 平均露光時間: 60.0 sec. / 平均電子線量: 39.0 e/Å2