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データを開く
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基本情報
登録情報 | データベース: PDB / ID: 6s1k | |||||||||
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タイトル | E. coli Core Signaling Unit, carrying QQQQ receptor mutation | |||||||||
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![]() | SIGNALING PROTEIN / chemotaxis / methyl-accepting chemotaxis protein / histidine kinase | |||||||||
機能・相同性 | ![]() regulation of protein histidine kinase activity / negative regulation of protein modification process / detection of chemical stimulus / methyl accepting chemotaxis protein complex / positive regulation of post-translational protein modification / bacterial-type flagellum-dependent swimming motility / protein histidine kinase activity / protein trimerization / regulation of bacterial-type flagellum-dependent cell motility / aerotaxis ...regulation of protein histidine kinase activity / negative regulation of protein modification process / detection of chemical stimulus / methyl accepting chemotaxis protein complex / positive regulation of post-translational protein modification / bacterial-type flagellum-dependent swimming motility / protein histidine kinase activity / protein trimerization / regulation of bacterial-type flagellum-dependent cell motility / aerotaxis / cell tip / regulation of chemotaxis / thermotaxis / signal complex assembly / receptor clustering / histidine kinase / phosphorelay signal transduction system / phosphorelay sensor kinase activity / establishment of localization in cell / cellular response to amino acid stimulus / cell motility / protein homooligomerization / chemotaxis / transmembrane signaling receptor activity / protein domain specific binding / signal transduction / ATP binding / identical protein binding / plasma membrane / cytosol / cytoplasm 類似検索 - 分子機能 | |||||||||
生物種 | ![]() ![]() | |||||||||
手法 | 電子顕微鏡法 / サブトモグラム平均法 / クライオ電子顕微鏡法 / 解像度: 8.38 Å | |||||||||
![]() | Cassidy, C.K. | |||||||||
資金援助 | ![]() ![]()
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![]() | ![]() タイトル: Structure and dynamics of the E. coli chemotaxis core signaling complex by cryo-electron tomography and molecular simulations. 著者: C Keith Cassidy / Benjamin A Himes / Dapeng Sun / Jun Ma / Gongpu Zhao / John S Parkinson / Phillip J Stansfeld / Zaida Luthey-Schulten / Peijun Zhang / ![]() ![]() 要旨: To enable the processing of chemical gradients, chemotactic bacteria possess large arrays of transmembrane chemoreceptors, the histidine kinase CheA, and the adaptor protein CheW, organized as ...To enable the processing of chemical gradients, chemotactic bacteria possess large arrays of transmembrane chemoreceptors, the histidine kinase CheA, and the adaptor protein CheW, organized as coupled core-signaling units (CSU). Despite decades of study, important questions surrounding the molecular mechanisms of sensory signal transduction remain unresolved, owing especially to the lack of a high-resolution CSU structure. Here, we use cryo-electron tomography and sub-tomogram averaging to determine a structure of the Escherichia coli CSU at sub-nanometer resolution. Based on our experimental data, we use molecular simulations to construct an atomistic model of the CSU, enabling a detailed characterization of CheA conformational dynamics in its native structural context. We identify multiple, distinct conformations of the critical P4 domain as well as asymmetries in the localization of the P3 bundle, offering several novel insights into the CheA signaling mechanism. | |||||||||
履歴 |
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構造の表示
ムービー |
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構造ビューア | 分子: ![]() ![]() |
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ダウンロード
PDBx/mmCIF形式 | ![]() | 433.2 KB | 表示 | ![]() |
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PDB形式 | ![]() | 308.8 KB | 表示 | ![]() |
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その他 | ![]() |
-検証レポート
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
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-関連構造データ
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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: 71454.180 Da / 分子数: 2 / 由来タイプ: 組換発現 由来: (組換発現) ![]() ![]() 遺伝子: cheA, b1888, JW1877 発現宿主: ![]() ![]() 参照: UniProt: P07363, histidine kinase #2: タンパク質 | 分子量: 18095.693 Da / 分子数: 2 / 由来タイプ: 組換発現 由来: (組換発現) ![]() ![]() 発現宿主: ![]() ![]() 参照: UniProt: P0A964*PLUS #3: タンパク質 | 分子量: 59495.758 Da / 分子数: 12 / 由来タイプ: 組換発現 由来: (組換発現) ![]() ![]() 遺伝子: tsr, cheD, b4355, JW4318 発現宿主: ![]() ![]() 参照: UniProt: P02942 |
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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: 2D ARRAY / 3次元再構成法: サブトモグラム平均法 |
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試料調製
構成要素 | 名称: core signaling complex of bacterial chemotaxis / タイプ: COMPLEX / Entity ID: all / 由来: RECOMBINANT |
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由来(天然) | 生物種: ![]() ![]() |
由来(組換発現) | 生物種: ![]() ![]() |
緩衝液 | pH: 7.4 |
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: Tecnai Polara / 画像提供: FEI Company |
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顕微鏡 | モデル: FEI POLARA 300 |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / Cs: 2 mm / C2レンズ絞り径: 100 µm |
撮影 | 電子線照射量: 1.3 e/Å2 フィルム・検出器のモデル: GATAN ULTRASCAN 4000 (4k x 4k) |
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解析
EMソフトウェア | 名称: MDFF / カテゴリ: モデル精密化 / 詳細: implemented in NAMD |
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION |
対称性 | 点対称性: C2 (2回回転対称) |
3次元再構成 | 解像度: 8.38 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 91636 / 対称性のタイプ: POINT |
EM volume selection | Num. of tomograms: 24 / Num. of volumes extracted: 91636 |
原子モデル構築 | プロトコル: FLEXIBLE FIT / 空間: REAL / Target criteria: global correlation coefficeint 詳細: MDFF was used to flexible fit atomic models of E. coli chemosensory proteins |