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基本情報
| 登録情報 | データベース: PDB / ID: 7xqh | ||||||
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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) | ||||||
要素 | C-terminal deletion mutant of gap junction alpha-1 protein (Cx43-M257) | ||||||
キーワード | MEMBRANE PROTEIN / Cx43 / Connexin / Gap junction channel / Gating mechanism | ||||||
| 機能・相同性 | 機能・相同性情報gap junction channel activity involved in cardiac conduction electrical coupling / negative regulation of gonadotropin secretion / microtubule-based transport / positive regulation of morphogenesis of an epithelium / positive regulation of mesodermal cell differentiation / cell communication by electrical coupling / negative regulation of trophoblast cell migration / SARS-CoV-2 targets PDZ proteins in cell-cell junction / gap junction channel activity involved in cell communication by electrical coupling / monoatomic ion transmembrane transporter activity ...gap junction channel activity involved in cardiac conduction electrical coupling / negative regulation of gonadotropin secretion / microtubule-based transport / positive regulation of morphogenesis of an epithelium / positive regulation of mesodermal cell differentiation / cell communication by electrical coupling / negative regulation of trophoblast cell migration / SARS-CoV-2 targets PDZ proteins in cell-cell junction / gap junction channel activity involved in cell communication by electrical coupling / monoatomic ion transmembrane transporter activity / gap junction hemi-channel activity / Oligomerization of connexins into connexons / Transport of connexins along the secretory pathway / cardiac conduction system development / atrial cardiac muscle cell action potential / gap junction assembly / Regulation of gap junction activity / Microtubule-dependent trafficking of connexons from Golgi to the plasma membrane / glutathione transmembrane transporter activity / bone remodeling / cell-cell contact zone / Golgi-associated vesicle membrane / connexin complex / cell communication by electrical coupling involved in cardiac conduction / Formation of annular gap junctions / Gap junction degradation / gap junction / export across plasma membrane / Gap junction assembly / glutamate secretion / gap junction channel activity / positive regulation of stem cell proliferation / tight junction / Mechanical load activates signaling by PIEZO1 and integrins in osteocytes / maintenance of blood-brain barrier / RHOJ GTPase cycle / establishment of mitotic spindle orientation / RHOQ GTPase cycle / efflux transmembrane transporter activity / intercalated disc / xenobiotic transport / alpha-tubulin binding / positive regulation of vascular associated smooth muscle cell proliferation / bone development / tubulin binding / negative regulation of cell growth / cell junction / beta-catenin binding / cellular response to amyloid-beta / intracellular protein localization / heart development / cell-cell signaling / positive regulation of cold-induced thermogenesis / spermatogenesis / monoatomic ion transmembrane transport / positive regulation of canonical NF-kappaB signal transduction / apical plasma membrane / membrane raft / Golgi membrane / innate immune response / focal adhesion / positive regulation of gene expression / endoplasmic reticulum membrane / Golgi apparatus / signal transduction / mitochondrion / nucleus / plasma membrane / cytoplasm 類似検索 - 分子機能 | ||||||
| 生物種 | Homo sapiens (ヒト) | ||||||
| 手法 | 電子顕微鏡法 / 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 3.8 Å | ||||||
データ登録者 | Lee, H.J. / Cha, H.J. / Jeong, H. / Lee, S.N. / Lee, C.W. / Woo, J.S. | ||||||
| 資金援助 | 韓国, 1件
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引用 | ジャーナル: Nat Commun / 年: 2023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. | ||||||
| 履歴 |
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構造の表示
| 構造ビューア | 分子: Molmil Jmol/JSmol |
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ダウンロードとリンク
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ダウンロード
| PDBx/mmCIF形式 | 7xqh.cif.gz | 226.5 KB | 表示 | PDBx/mmCIF形式 |
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| PDB形式 | pdb7xqh.ent.gz | 178.8 KB | 表示 | PDB形式 |
| PDBx/mmJSON形式 | 7xqh.json.gz | ツリー表示 | PDBx/mmJSON形式 | |
| その他 | その他のダウンロード |
-検証レポート
| アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/xq/7xqh ftp://data.pdbj.org/pub/pdb/validation_reports/xq/7xqh | HTTPS FTP |
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-関連構造データ
| 関連構造データ | ![]() 33396MC ![]() 7f92C ![]() 7f93C ![]() 7f94C ![]() 7xq9C ![]() 7xqbC ![]() 7xqdC ![]() 7xqfC ![]() 7xqgC ![]() 7xqiC ![]() 7xqjC M: このデータのモデリングに利用したマップデータ 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 F&H 検索 |
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リンク
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集合体
| 登録構造単位 | ![]()
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要素
| #1: タンパク質 | 分子量: 29396.547 Da / 分子数: 6 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: GJA1, GJAL / 発現宿主: Homo sapiens (ヒト) / 参照: UniProt: P17302Has protein modification | Y | |
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-実験情報
-実験
| 実験 | 手法: 電子顕微鏡法 |
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| EM実験 | 試料の集合状態: PARTICLE / 3次元再構成法: 単粒子再構成法 |
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試料調製
| 構成要素 | 名称: Dodecameric complex of C-terminal deletion mutant of human Cx43/GJA1 (Cx43-M257) in lipid nanodiscs (POPE) タイプ: COMPLEX 詳細: Hemichannel of Human Cx43-M257 gap junction channel with gate-covering NTH and TM1-intermediate conformation Entity ID: all / 由来: RECOMBINANT |
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| 由来(天然) | 生物種: Homo sapiens (ヒト) |
| 由来(組換発現) | 生物種: Homo sapiens (ヒト) |
| 緩衝液 | pH: 8 |
| 試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
| 急速凍結 | 凍結剤: ETHANE |
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電子顕微鏡撮影
| 実験機器 | ![]() モデル: Titan Krios / 画像提供: FEI Company |
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| 顕微鏡 | モデル: FEI TITAN KRIOS |
| 電子銃 | 電子線源: FIELD EMISSION GUN / 加速電圧: 300 kV / 照射モード: FLOOD BEAM |
| 電子レンズ | モード: BRIGHT FIELD / 最大 デフォーカス(公称値): 2400 nm / 最小 デフォーカス(公称値): 900 nm |
| 撮影 | 電子線照射量: 72.42 e/Å2 フィルム・検出器のモデル: GATAN K3 BIOQUANTUM (6k x 4k) |
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解析
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| CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
| 3次元再構成 | 解像度: 3.8 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 50633 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
| 精密化 | 立体化学のターゲット値: CDL v1.2 | ||||||||||||||||||||||||
| 拘束条件 |
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Homo sapiens (ヒト)
韓国, 1件
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