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基本情報
登録情報 | データベース: PDB / ID: 8u18 | |||||||||
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タイトル | Cryo-EM structure of murine Thrombopoietin receptor ectodomain in complex with Tpo | |||||||||
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![]() | CYTOKINE/RECEPTOR / Receptor / cytokine / signalling / haematopoiesis / CYTOKINE-RECEPTOR complex | |||||||||
機能・相同性 | ![]() thrombopoietin receptor activity / regulation of chemokine production / positive regulation of hematopoietic stem cell proliferation / regulation of stem cell division / megakaryocyte differentiation / positive regulation of megakaryocyte differentiation / thrombopoietin-mediated signaling pathway / regulation of stem cell proliferation / myeloid cell differentiation / definitive hemopoiesis ...thrombopoietin receptor activity / regulation of chemokine production / positive regulation of hematopoietic stem cell proliferation / regulation of stem cell division / megakaryocyte differentiation / positive regulation of megakaryocyte differentiation / thrombopoietin-mediated signaling pathway / regulation of stem cell proliferation / myeloid cell differentiation / definitive hemopoiesis / platelet formation / homeostasis of number of cells / cytokine activity / hormone activity / positive regulation of protein phosphorylation / cell population proliferation / positive regulation of ERK1 and ERK2 cascade / positive regulation of phosphatidylinositol 3-kinase/protein kinase B signal transduction / DNA-binding transcription factor activity / positive regulation of gene expression / negative regulation of apoptotic process / cell surface / Golgi apparatus / extracellular space / plasma membrane 類似検索 - 分子機能 | |||||||||
生物種 | ![]() ![]() ![]() ![]() | |||||||||
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: 3.6 Å | |||||||||
![]() | Sarson-Lawrence, K.S. / Hardy, J.M. / Leis, A. / Babon, J.J. / Kershaw, N.J. | |||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Cryo-EM structure of the extracellular domain of murine Thrombopoietin Receptor in complex with Thrombopoietin. 著者: Kaiseal T G Sarson-Lawrence / Joshua M Hardy / Josephine Iaria / Dina Stockwell / Kira Behrens / Tamanna Saiyed / Cyrus Tan / Leila Jebeli / Nichollas E Scott / Toby A Dite / Nicos A Nicola / ...著者: Kaiseal T G Sarson-Lawrence / Joshua M Hardy / Josephine Iaria / Dina Stockwell / Kira Behrens / Tamanna Saiyed / Cyrus Tan / Leila Jebeli / Nichollas E Scott / Toby A Dite / Nicos A Nicola / Andrew P Leis / Jeffrey J Babon / Nadia J Kershaw / ![]() 要旨: Thrombopoietin (Tpo) is the primary regulator of megakaryocyte and platelet numbers and is required for haematopoetic stem cell maintenance. Tpo functions by binding its receptor (TpoR, a homodimeric ...Thrombopoietin (Tpo) is the primary regulator of megakaryocyte and platelet numbers and is required for haematopoetic stem cell maintenance. Tpo functions by binding its receptor (TpoR, a homodimeric Class I cytokine receptor) and initiating cell proliferation or differentiation. Here we characterise the murine Tpo:TpoR signalling complex biochemically and structurally, using cryo-electron microscopy. Tpo uses opposing surfaces to recruit two copies of receptor, forming a 1:2 complex. Although it binds to the same, membrane-distal site on both receptor chains, it does so with significantly different affinities and its highly glycosylated C-terminal domain is not required. In one receptor chain, a large insertion, unique to TpoR, forms a partially structured loop that contacts cytokine. Tpo binding induces the juxtaposition of the two receptor chains adjacent to the cell membrane. The therapeutic agent romiplostim also targets the cytokine-binding site and the characterisation presented here supports the future development of improved TpoR agonists. | |||||||||
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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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 | ![]() | 194.6 KB | 表示 | ![]() |
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PDB形式 | ![]() | 147 KB | 表示 | ![]() |
PDBx/mmJSON形式 | ![]() | ツリー表示 | ![]() | |
その他 | ![]() |
-検証レポート
文書・要旨 | ![]() | 1.1 MB | 表示 | ![]() |
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文書・詳細版 | ![]() | 1.1 MB | 表示 | |
XML形式データ | ![]() | 40.5 KB | 表示 | |
CIF形式データ | ![]() | 59.1 KB | 表示 | |
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 | ![]() 41805MC 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 ![]() |
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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: 56559.676 Da / 分子数: 2 断片: extracellular domain,leucine zipper,extracellular domain,leucine zipper 由来タイプ: 組換発現 由来: (組換発現) ![]() ![]() ![]() ![]() 遺伝子: Mpl, Tpor, GCN4 / 細胞株 (発現宿主): Expi293F / 発現宿主: ![]() #2: タンパク質 | | 分子量: 19611.674 Da / 分子数: 1 / 断片: N-terminal domain / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() #3: 多糖 | #4: 糖 | ChemComp-NAG / #5: 糖 | 研究の焦点であるリガンドがあるか | N | Has 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 |
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分子量 | 値: 0.131698 MDa / 実験値: NO | ||||||||||||||||||||||||||||
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由来(組換発現) |
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緩衝液 | pH: 7.5 | ||||||||||||||||||||||||||||
緩衝液成分 |
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試料 | 濃度: 0.55 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES 詳細: TpoR1-479-LeuZ and TPON were combined with a molar ratio of 1:1.5 and applied to superdex 200 10/300 increased column equilibrated in TBS pH7.5. The resultant peaks were analysed by SDS-PAGE ...詳細: TpoR1-479-LeuZ and TPON were combined with a molar ratio of 1:1.5 and applied to superdex 200 10/300 increased column equilibrated in TBS pH7.5. The resultant peaks were analysed by SDS-PAGE and SEC-MALS, and those corresponding to the complex were pooled and concentrated to 0.55 mg/ml. CTAB (Hexadecyl-trimethylammonium bromide) was added right before plunge freezing to a concentration of 0.005% (w/v). | ||||||||||||||||||||||||||||
試料支持 | グリッドの材料: COPPER / グリッドのサイズ: 300 divisions/in. / グリッドのタイプ: Quantifoil R1.2/1.3 | ||||||||||||||||||||||||||||
急速凍結 | 装置: FEI VITROBOT MARK IV / 凍結剤: ETHANE / 湿度: 90 % / 凍結前の試料温度: 277.15 K 詳細: Blot time of 4 s, blot force of 6 and no wait time or drain time. |
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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: ![]() |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 130000 X / 最大 デフォーカス(公称値): 3600 nm / 最小 デフォーカス(公称値): 400 nm / Cs: 2.7 mm / アライメント法: COMA FREE |
試料ホルダ | 凍結剤: NITROGEN 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER |
撮影 | 平均露光時間: 2.38 sec. / 電子線照射量: 50.57 e/Å2 フィルム・検出器のモデル: GATAN K3 BIOQUANTUM (6k x 4k) 撮影したグリッド数: 1 / 実像数: 6130 |
電子光学装置 | エネルギーフィルター名称: GIF Bioquantum |
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解析
EMソフトウェア |
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画像処理 | 詳細: Movies were aligned using patch motion correction and defocus values were estimated using patch CTF estimation. Images with significant astigmatism, ice contamination, or drift were removed ...詳細: Movies were aligned using patch motion correction and defocus values were estimated using patch CTF estimation. Images with significant astigmatism, ice contamination, or drift were removed resulting in 5,297 micrographs. | ||||||||||||||||||||||||||||||||||||||||||||||||
CTF補正 | 詳細: Defocus values were estimated using patch CTF estimation and CTF correction was performed during 3D reccnstruction. タイプ: NONE | ||||||||||||||||||||||||||||||||||||||||||||||||
粒子像の選択 | 選択した粒子像数: 2353523 詳細: Templates for picking were generated using a gaussian based picking approach, followed by 2D classification and selection of high-quality 2D classes for template picking. | ||||||||||||||||||||||||||||||||||||||||||||||||
対称性 | 点対称性: C1 (非対称) | ||||||||||||||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 3.6 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 745000 / アルゴリズム: BACK PROJECTION 詳細: Final map was generated using Non-uniform refinement followed by 3DFlex refinement in cryoSPARC. Map was sharpened by deepEMhancer. クラス平均像の数: 73 / 対称性のタイプ: POINT | ||||||||||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | プロトコル: FLEXIBLE FIT / 空間: REAL / Target criteria: Cross-correlation coefficient 詳細: ChimeraX was used to perform rigid-body fitting of domains and modelling was performed using Coot and ISOLDE. Refinement was carried out in PHENIX. | ||||||||||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | 詳細: Multimer complex of the complete assembly was produced using AlphaFold2 on Google CoLab Source name: AlphaFold / タイプ: in silico model | ||||||||||||||||||||||||||||||||||||||||||||||||
拘束条件 |
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