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基本情報
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タイトル | Hemichannel-focused structure of C-terminal truncated connexin43/Cx43/GJA1 gap junction intercellular channel in POPE nanodiscs (GCN-TM1i conformation) | |||||||||
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機能・相同性 | ![]() gap junction channel activity involved in cardiac conduction electrical coupling / negative regulation of gonadotropin secretion / positive regulation of striated muscle tissue development / milk ejection reflex / positive regulation of morphogenesis of an epithelium / positive regulation of mesodermal cell differentiation / atrial ventricular junction remodeling / cell communication by chemical coupling / cell communication by electrical coupling / neuroblast migration ...gap junction channel activity involved in cardiac conduction electrical coupling / negative regulation of gonadotropin secretion / positive regulation of striated muscle tissue development / milk ejection reflex / positive regulation of morphogenesis of an epithelium / positive regulation of mesodermal cell differentiation / atrial ventricular junction remodeling / cell communication by chemical coupling / cell communication by electrical coupling / neuroblast migration / columnar/cuboidal epithelial cell maturation / gap junction hemi-channel activity / negative regulation of trophoblast cell migration / microtubule-based transport / monoatomic ion transmembrane transporter activity / regulation of bone remodeling / SARS-CoV-2 targets PDZ proteins in cell-cell junction / regulation of ventricular cardiac muscle cell membrane depolarization / gap junction channel activity involved in cell communication by electrical coupling / contractile muscle fiber / Oligomerization of connexins into connexons / Transport of connexins along the secretory pathway / glutathione transmembrane transporter activity / Microtubule-dependent trafficking of connexons from Golgi to the plasma membrane / gap junction assembly / cellular response to pH / atrial cardiac muscle cell action potential / Regulation of gap junction activity / skeletal muscle tissue regeneration / cardiac conduction system development / connexin complex / regulation of atrial cardiac muscle cell membrane depolarization / Golgi-associated vesicle membrane / Formation of annular gap junctions / fascia adherens / Gap junction degradation / cell communication by electrical coupling involved in cardiac conduction / cell-cell contact zone / gap junction / Gap junction assembly / gap junction channel activity / bone remodeling / export across plasma membrane / adult heart development / regulation of bone mineralization / xenobiotic transport / regulation of ventricular cardiac muscle cell membrane repolarization / glutamate secretion / tight junction / blood vessel morphogenesis / lens development in camera-type eye / intermediate filament / embryonic digit morphogenesis / maintenance of blood-brain barrier / positive regulation of stem cell proliferation / beta-tubulin binding / heart looping / RHOJ GTPase cycle / RHOQ GTPase cycle / efflux transmembrane transporter activity / establishment of mitotic spindle orientation / intercalated disc / lateral plasma membrane / alpha-tubulin binding / T cell proliferation / monoatomic ion transmembrane transport / positive regulation of vascular associated smooth muscle cell proliferation / tubulin binding / protein tyrosine kinase binding / neuron migration / bone development / negative regulation of cell growth / beta-catenin binding / osteoblast differentiation / cellular response to amyloid-beta / male gonad development / protein localization / cell junction / cell-cell signaling / heart development / positive regulation of cold-induced thermogenesis / scaffold protein binding / spermatogenesis / positive regulation of canonical NF-kappaB signal transduction / in utero embryonic development / apical plasma membrane / membrane raft / Golgi membrane / negative regulation of gene expression / intracellular membrane-bounded organelle / signaling receptor binding / focal adhesion / endoplasmic reticulum membrane / positive regulation of gene expression / Golgi apparatus / signal transduction / mitochondrion / nucleoplasm / nucleus / plasma membrane 類似検索 - 分子機能 | |||||||||
生物種 | ![]() | |||||||||
手法 | 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 3.8 Å | |||||||||
![]() | Lee HJ / Cha HJ / Jeong H / Lee SN / Lee CW / Woo JS | |||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Conformational changes in the human Cx43/GJA1 gap junction channel visualized using cryo-EM. 著者: Hyuk-Joon Lee / Hyung Jin Cha / Hyeongseop Jeong / Seu-Na Lee / Chang-Won Lee / Minsoo Kim / Jejoong Yoo / Jae-Sung Woo / ![]() 要旨: Connexin family proteins assemble into hexameric hemichannels in the cell membrane. The hemichannels dock together between two adjacent membranes to form gap junction intercellular channels (GJIChs). ...Connexin family proteins assemble into hexameric hemichannels in the cell membrane. The hemichannels dock together between two adjacent membranes to form gap junction intercellular channels (GJIChs). We report the cryo-electron microscopy structures of Cx43 GJICh, revealing the dynamic equilibrium state of various channel conformations in detergents and lipid nanodiscs. We identify three different N-terminal helix conformations of Cx43-gate-covering (GCN), pore-lining (PLN), and flexible intermediate (FIN)-that are randomly distributed in purified GJICh particles. The conformational equilibrium shifts to GCN by cholesteryl hemisuccinates and to PLN by C-terminal truncations and at varying pH. While GJIChs that mainly comprise GCN protomers are occluded by lipids, those containing conformationally heterogeneous protomers show markedly different pore sizes. We observe an α-to-π-helix transition in the first transmembrane helix, which creates a side opening to the membrane in the FIN and PLN conformations. This study provides basic structural information to understand the mechanisms of action and regulation of Cx43 GJICh. | |||||||||
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マップデータ | ![]() | 48.1 MB | ![]() | |
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ヘッダ (付随情報) | ![]() ![]() | 14.3 KB 14.3 KB | 表示 表示 | ![]() |
FSC (解像度算出) | ![]() | 9.2 KB | 表示 | ![]() |
画像 | ![]() | 8.7 KB | ||
その他 | ![]() ![]() | 48.4 MB 48.4 MB | ||
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
-関連構造データ
関連構造データ | ![]() 7xqhMC ![]() 7f92C ![]() 7f93C ![]() 7f94C ![]() 7xq9C ![]() 7xqbC ![]() 7xqdC ![]() 7xqfC ![]() 7xqgC ![]() 7xqiC ![]() 7xqjC M: このマップから作成された原子モデル C: 同じ文献を引用 ( |
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類似構造データ | 類似検索 - 機能・相同性 ![]() |
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リンク
EMDBのページ | ![]() ![]() |
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「今月の分子」の関連する項目 |
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マップ
ファイル | ![]() | ||||||||||||||||||||
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注釈 | unsharpened map | ||||||||||||||||||||
ボクセルのサイズ | X=Y=Z: 0.848 Å | ||||||||||||||||||||
密度 |
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対称性 | 空間群: 1 | ||||||||||||||||||||
詳細 | EMDB XML:
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-添付データ
-ハーフマップ: half map
ファイル | emd_33396_half_map_1.map | ||||||||||||
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注釈 | half map | ||||||||||||
投影像・断面図 |
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密度ヒストグラム |
-ハーフマップ: half map
ファイル | emd_33396_half_map_2.map | ||||||||||||
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注釈 | half map | ||||||||||||
投影像・断面図 |
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試料の構成要素
-全体 : Dodecameric complex of C-terminal deletion mutant of human Cx43/G...
全体 | 名称: Dodecameric complex of C-terminal deletion mutant of human Cx43/GJA1 (Cx43-M257) in lipid nanodiscs (POPE) |
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要素 |
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-超分子 #1: Dodecameric complex of C-terminal deletion mutant of human Cx43/G...
超分子 | 名称: Dodecameric complex of C-terminal deletion mutant of human Cx43/GJA1 (Cx43-M257) in lipid nanodiscs (POPE) タイプ: complex / ID: 1 / キメラ: Yes / 親要素: 0 / 含まれる分子: all 詳細: Hemichannel of Human Cx43-M257 gap junction channel with gate-covering NTH and TM1-intermediate conformation |
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由来(天然) | 生物種: ![]() |
-分子 #1: C-terminal deletion mutant of gap junction alpha-1 protein (Cx43-M257)
分子 | 名称: C-terminal deletion mutant of gap junction alpha-1 protein (Cx43-M257) タイプ: protein_or_peptide / ID: 1 / コピー数: 6 / 光学異性体: LEVO |
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由来(天然) | 生物種: ![]() |
分子量 | 理論値: 29.396547 KDa |
組換発現 | 生物種: ![]() |
配列 | 文字列: MGDWSALGKL LDKVQAYSTA GGKVWLSVLF IFRILLLGTA VESAWGDEQS AFRCNTQQPG CENVCYDKSF PISHVRFWVL QIIFVSVPT LLYLAHVFYV MRKEEKLNKK EEELKVAQTD GVNVDMHLKQ IEIKKFKYGI EEHGKVKMRG GLLRTYIISI L FKSIFEVA ...文字列: MGDWSALGKL LDKVQAYSTA GGKVWLSVLF IFRILLLGTA VESAWGDEQS AFRCNTQQPG CENVCYDKSF PISHVRFWVL QIIFVSVPT LLYLAHVFYV MRKEEKLNKK EEELKVAQTD GVNVDMHLKQ IEIKKFKYGI EEHGKVKMRG GLLRTYIISI L FKSIFEVA FLLIQWYIYG FSLSAVYTCK RDPCPHQVDC FLSRPTEKTI FIIFMLVVSL VSLALNIIEL FYVFFKGVKD RV KGKSDPY HATSGALSPA |
-実験情報
-構造解析
手法 | クライオ電子顕微鏡法 |
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![]() | 単粒子再構成法 |
試料の集合状態 | particle |
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試料調製
緩衝液 | pH: 8 |
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凍結 | 凍結剤: ETHANE |
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電子顕微鏡法
顕微鏡 | FEI TITAN KRIOS |
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撮影 | フィルム・検出器のモデル: GATAN K3 BIOQUANTUM (6k x 4k) 平均電子線量: 72.42 e/Å2 |
電子線 | 加速電圧: 300 kV / 電子線源: ![]() |
電子光学系 | 照射モード: FLOOD BEAM / 撮影モード: BRIGHT FIELD / 最大 デフォーカス(公称値): 2.4 µm / 最小 デフォーカス(公称値): 0.9 µm |
実験機器 | ![]() モデル: Titan Krios / 画像提供: FEI Company |