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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: 8a7p | ||||||||||||
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| タイトル | beta-2-microglobulin DeltaN6 amyloid fibril form 2PFb | ||||||||||||
要素 | Beta-2-microglobulin form pI 5.3 | ||||||||||||
キーワード | PROTEIN FIBRIL / Amyloid / fibril / helical / cross-beta / dialysis-related amyloidosis / b2m / polymorph | ||||||||||||
| 機能・相同性 | 機能・相同性情報early endosome lumen / Nef mediated downregulation of MHC class I complex cell surface expression / DAP12 interactions / Endosomal/Vacuolar pathway / T cell mediated cytotoxicity / Antigen Presentation: Folding, assembly and peptide loading of class I MHC / regulation of iron ion transport / cellular response to iron(III) ion / negative regulation of iron ion transport / negative regulation of forebrain neuron differentiation ...early endosome lumen / Nef mediated downregulation of MHC class I complex cell surface expression / DAP12 interactions / Endosomal/Vacuolar pathway / T cell mediated cytotoxicity / Antigen Presentation: Folding, assembly and peptide loading of class I MHC / regulation of iron ion transport / cellular response to iron(III) ion / negative regulation of iron ion transport / negative regulation of forebrain neuron differentiation / antigen processing and presentation of exogenous protein antigen via MHC class Ib, TAP-dependent / ER to Golgi transport vesicle membrane / peptide antigen assembly with MHC class I protein complex / regulation of erythrocyte differentiation / response to molecule of bacterial origin / HFE-transferrin receptor complex / transferrin transport / MHC class I peptide loading complex / cellular response to iron ion / negative regulation of receptor-mediated endocytosis / positive regulation of T cell cytokine production / antigen processing and presentation of endogenous peptide antigen via MHC class I / MHC class I protein complex / peptide antigen assembly with MHC class II protein complex / negative regulation of neurogenesis / cellular response to nicotine / MHC class II protein complex / positive regulation of receptor-mediated endocytosis / multicellular organismal-level iron ion homeostasis / positive regulation of T cell mediated cytotoxicity / specific granule lumen / positive regulation of immune response / antigen processing and presentation of exogenous peptide antigen via MHC class II / peptide antigen binding / phagocytic vesicle membrane / recycling endosome membrane / positive regulation of T cell activation / negative regulation of epithelial cell proliferation / Interferon gamma signaling / Immunoregulatory interactions between a Lymphoid and a non-Lymphoid cell / Modulation by Mtb of host immune system / positive regulation of cellular senescence / sensory perception of smell / tertiary granule lumen / MHC class II protein complex binding / DAP12 signaling / T cell differentiation in thymus / late endosome membrane / negative regulation of neuron projection development / ER-Phagosome pathway / protein refolding / early endosome membrane / amyloid fibril formation / protein homotetramerization / intracellular iron ion homeostasis / learning or memory / endoplasmic reticulum lumen / Amyloid fiber formation / Golgi membrane / external side of plasma membrane / lysosomal membrane / focal adhesion / Neutrophil degranulation / SARS-CoV-2 activates/modulates innate and adaptive immune responses / structural molecule activity / endoplasmic reticulum / Golgi apparatus / protein homodimerization activity / : / extracellular exosome / extracellular region / membrane / identical protein binding / plasma membrane / cytosol 類似検索 - 分子機能 | ||||||||||||
| 生物種 | Homo sapiens (ヒト) | ||||||||||||
| 手法 | 電子顕微鏡法 / らせん対称体再構成法 / クライオ電子顕微鏡法 / 解像度: 3.4 Å | ||||||||||||
データ登録者 | Wilkinson, M. / Gallardo, R. / Radford, S.E. / Ranson, N.A. | ||||||||||||
| 資金援助 | 英国, 3件
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引用 | ジャーナル: Nat Commun / 年: 2023タイトル: Disease-relevant β-microglobulin variants share a common amyloid fold. 著者: Martin Wilkinson / Rodrigo U Gallardo / Roberto Maya Martinez / Nicolas Guthertz / Masatomo So / Liam D Aubrey / Sheena E Radford / Neil A Ranson / ![]() 要旨: β-microglobulin (βm) and its truncated variant ΔΝ6 are co-deposited in amyloid fibrils in the joints, causing the disorder dialysis-related amyloidosis (DRA). Point mutations of βm result in ...β-microglobulin (βm) and its truncated variant ΔΝ6 are co-deposited in amyloid fibrils in the joints, causing the disorder dialysis-related amyloidosis (DRA). Point mutations of βm result in diseases with distinct pathologies. βm-D76N causes a rare systemic amyloidosis with protein deposited in the viscera in the absence of renal failure, whilst βm-V27M is associated with renal failure, with amyloid deposits forming predominantly in the tongue. Here we use cryoEM to determine the structures of fibrils formed from these variants under identical conditions in vitro. We show that each fibril sample is polymorphic, with diversity arising from a 'lego-like' assembly of a common amyloid building block. These results suggest a 'many sequences, one amyloid fold' paradigm in contrast with the recently reported 'one sequence, many amyloid folds' behaviour of intrinsically disordered proteins such as tau and Aβ. | ||||||||||||
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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 | 8a7p.cif.gz | 119.1 KB | 表示 | PDBx/mmCIF形式 |
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| PDB形式 | pdb8a7p.ent.gz | 80.1 KB | 表示 | PDB形式 |
| PDBx/mmJSON形式 | 8a7p.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/a7/8a7p ftp://data.pdbj.org/pub/pdb/validation_reports/a7/8a7p | 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: 11153.478 Da / 分子数: 6 / 変異: deltaN6, K6M / 由来タイプ: 組換発現 詳細: Natural variant deltaN6 with additional methionine added prior to peptide sequence for bacterial expression 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: B2M, CDABP0092, HDCMA22P / Variant: DeltaN6 / 詳細 (発現宿主): pINK / 発現宿主: ![]() 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: FILAMENT / 3次元再構成法: らせん対称体再構成法 |
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試料調製
| 構成要素 | 名称: Amyloid fibril polymorph 2PFb of the beta-2-microglobulin deltaN6 variant. タイプ: COMPLEX 詳細: Recombinantly expressed and fibrillated in vitro at pH 6.2 Entity ID: all / 由来: RECOMBINANT | |||||||||||||||
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| 分子量 | 実験値: NO | |||||||||||||||
| 由来(天然) | 生物種: Homo sapiens (ヒト) | |||||||||||||||
| 由来(組換発現) | 生物種: ![]() | |||||||||||||||
| 緩衝液 | pH: 6.2 | |||||||||||||||
| 緩衝液成分 |
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| 試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES 詳細: Fibrillation conditions: 20 uM monomeric b2m-DN6 at 37C with shaking at 600 rpm for 2-3 weeks | |||||||||||||||
| 試料支持 | 詳細: The grid was plasma cleaned prior to 2x application of graphene oxide-DDM mixture, then grid was used immediately for sample application and vitrification 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: EMS Lacey Carbon | |||||||||||||||
| 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 K / 詳細: 6s blot |
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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 / 倍率(公称値): 96000 X / 最大 デフォーカス(公称値): 2500 nm / 最小 デフォーカス(公称値): 1300 nm / Cs: 2.7 mm / C2レンズ絞り径: 50 µm / アライメント法: COMA FREE |
| 試料ホルダ | 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER |
| 撮影 | 平均露光時間: 7 sec. / 電子線照射量: 43 e/Å2 フィルム・検出器のモデル: FEI FALCON IV (4k x 4k) 撮影したグリッド数: 1 / 実像数: 4095 詳細: 1687 raw EER frames were collected per image and combined into 40 fractions for processing |
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解析
| EMソフトウェア |
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| CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||||||
| らせん対称 | 回転角度/サブユニット: -0.6 ° / 軸方向距離/サブユニット: 4.86 Å / らせん対称軸の対称性: C1 | ||||||||||||||||||||||||||||||||||||||||
| 粒子像の選択 | 選択した粒子像数: 612949 詳細: Manually picked a subset of images to train a model for automatic fibril segment picking in crYOLO | ||||||||||||||||||||||||||||||||||||||||
| 3次元再構成 | 解像度: 3.4 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 10594 / 対称性のタイプ: HELICAL | ||||||||||||||||||||||||||||||||||||||||
| 原子モデル構築 | B value: 81 / プロトコル: AB INITIO MODEL / 空間: REAL |
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万見について




Homo sapiens (ヒト)
英国, 3件
引用










PDBj





FIELD EMISSION GUN