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基本情報
登録情報 | データベース: PDB / ID: 8cpc | |||||||||
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タイトル | 3D electron diffraction structure of Hen Egg-White Lysozyme from nano-crystals obtained by high pressure freezing and cryo-sectioning | |||||||||
![]() | Lysozyme C | |||||||||
![]() | HYDROLASE / nano-crystals | |||||||||
機能・相同性 | ![]() Lactose synthesis / Antimicrobial peptides / Neutrophil degranulation / beta-N-acetylglucosaminidase activity / cell wall macromolecule catabolic process / lysozyme / lysozyme activity / defense response to Gram-negative bacterium / killing of cells of another organism / defense response to Gram-positive bacterium ...Lactose synthesis / Antimicrobial peptides / Neutrophil degranulation / beta-N-acetylglucosaminidase activity / cell wall macromolecule catabolic process / lysozyme / lysozyme activity / defense response to Gram-negative bacterium / killing of cells of another organism / defense response to Gram-positive bacterium / defense response to bacterium / endoplasmic reticulum / extracellular space / identical protein binding / cytoplasm 類似検索 - 分子機能 | |||||||||
生物種 | ![]() ![]() | |||||||||
手法 | 電子線結晶学 / ネガティブ染色法 / クライオ電子顕微鏡法 / 解像度: 2.91 Å | |||||||||
![]() | Moriscot, C. / Schoehn, G. / Housset, D. | |||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: High pressure freezing and cryo-sectioning can be used for protein structure determination by electron diffraction. 著者: Christine Moriscot / Guy Schoehn / Dominique Housset / ![]() 要旨: Electron diffraction of three-dimensional nanometer sized crystals has emerged since 2013 as an efficient technique to solve the structure of both small organic molecules and model proteins. However, ...Electron diffraction of three-dimensional nanometer sized crystals has emerged since 2013 as an efficient technique to solve the structure of both small organic molecules and model proteins. However, the major bottleneck of the technique when applied to protein samples is to produce nano-crystals that do not exceed 200 to 300 nm in at least one dimension and to deposit them on a grid while keeping the minimum amount of solvent around them. Since the presence of amorphous solvent around the crystal, necessary to preserve its integrity, increases the amount of diffuse scattering, thus degrading the signal-to noise ratio of the diffraction signal, other sample preparation strategies have been developed. One of them is the milling of thin crystal lamella using focused ion beam (FIB), which was successfully applied to several protein crystals. Here, we present a new approach that uses cryo-sectioning after high pressure freezing of dextran embedded protein crystals. 150 to 200 nm thick cryo-sections of hen egg white lysozyme tetragonal crystals where used for electron diffraction experiments. Complete diffraction data up to 2.9 Å resolution have been collected and the lysozyme structure has been solved by molecular replacement and refined against these data. Our data demonstrate that cryo-sectioning can preserve protein structure at high resolution and can be used as a new sample preparation technique for 3D electron diffraction experiments of protein crystals. The different orientations found in the crystal chips and their large number resulting from the cryo-sectioning make the latter an attractive approach as it combines advantages from both blotting approaches (number of crystals) and FIB-milling (controlled thickness and absence of solvent around the crystal). | |||||||||
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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-検証レポート
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-関連構造データ
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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単位格子 |
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Components on special symmetry positions |
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要素
#1: タンパク質 | 分子量: 14331.160 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() |
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#2: 水 | ChemComp-HOH / |
-実験情報
-実験
実験 | 手法: 電子線結晶学 |
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EM実験 | 試料の集合状態: 3D ARRAY / 3次元再構成法: 電子線結晶学 |
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試料調製
構成要素 | 名称: Monomer of Hen Egg-White Lysozyme / タイプ: COMPLEX / 詳細: Purchased / Entity ID: #1 / 由来: NATURAL | ||||||||||||
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分子量 | 実験値: NO | ||||||||||||
由来(天然) | 生物種: ![]() ![]() | ||||||||||||
EM crystal formation | 詳細: Lysozyme (50 mg/ml) was mixed 1 to 1 to precipitant solution (100mM Na citrate pH 5.5 and 0.8 to 1.6 M NaCl). Crystals were grown by the hanging drop method at room temperature. | ||||||||||||
緩衝液 | pH: 5.5 / 詳細: 100 mM sodium citrate pH 5.5, 0.8-1.6 M NaCl | ||||||||||||
緩衝液成分 |
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試料 | 濃度: 50 mg/ml / 包埋: YES / シャドウイング: NO / 染色: YES / 凍結: YES | ||||||||||||
染色 | タイプ: NONE 詳細: The blue dye (Brillant blue) is used to see the crystals during cryo-sectioning 染色剤: Brilliant blue | ||||||||||||
試料支持 | グリッドの材料: COPPER / グリッドのサイズ: 200 divisions/in. / グリッドのタイプ: Quantifoil | ||||||||||||
EM embedding | 詳細: 40% Dextran in phosphate buffer / Material: dextran | ||||||||||||
急速凍結 | 凍結剤: NITROGEN 詳細: Freezing carried out at high pressure (210 MPa) and -196 C, using a Leica EM HPM100 |
-データ収集
実験機器 | ![]() モデル: Tecnai F20 / 画像提供: FEI Company | |||||||||||||||||||||
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顕微鏡 | モデル: FEI TECNAI F20 詳細: Camera length used 730 mm and 1000 mm (corresponding to 1285 and 1825 mm calibrated values) | |||||||||||||||||||||
電子銃 | 電子線源: ![]() | |||||||||||||||||||||
電子レンズ | モード: DIFFRACTION / 最大 デフォーカス(公称値): 0 nm / 最小 デフォーカス(公称値): 0 nm / アライメント法: BASIC | |||||||||||||||||||||
試料ホルダ | 凍結剤: NITROGEN 試料ホルダーモデル: GATAN 626 SINGLE TILT LIQUID NITROGEN CRYO TRANSFER HOLDER 最高温度: 106 K / 最低温度: 101 K | |||||||||||||||||||||
撮影 | 平均露光時間: 0.25 sec. / 電子線照射量: 0.004 e/Å2 / フィルム・検出器のモデル: OTHER / Num. of diffraction images: 1408 / 撮影したグリッド数: 1 詳細: ASI Medipix3RX hybrid pixel detector used. Images were collected at 4 frames per second, in continuous rotation mode and 0.367 degrees per frames. | |||||||||||||||||||||
画像スキャン | サンプリングサイズ: 55 µm / 横: 512 / 縦: 512 | |||||||||||||||||||||
EM回折 シェル |
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EM回折 統計 | 詳細: Phases obtained by Molecular Replacement, using PHASER and the 193L pdb entry as model. フーリエ空間範囲: 96.5 % / 再高解像度: 2.91 Å / 測定した強度の数: 87489 / 構造因子数: 2640 / 位相誤差の除外基準: no phase error rejection / Rmerge: 61.1 |
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解析
ソフトウェア | 名称: REFMAC / バージョン: 5.8.0267 / 分類: 精密化 / Contact author: Garib N. Murshudov / Contact author email: garib[at]mrc-lmb.cam.ac.uk / 日付: 2020-24-08 解説: (un)restrained refinement or idealisation of macromolecular structures | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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EMソフトウェア | バージョン: 2.8.3 / カテゴリ: 分子置換 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
画像処理 | 詳細: A flat-field correction was applied to all diffraction images with ImageJ before data processing with XDS. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
EM 3D crystal entity | ∠α: 90 ° / ∠β: 90 ° / ∠γ: 90 ° / A: 76.89 Å / B: 76.89 Å / C: 37.76 Å / 空間群名: P43212 / 空間群番号: 96 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
CTF補正 | タイプ: NONE | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
3次元再構成 | 手法: CRYSTALLOGRAPHY / 解像度: 2.91 Å / 解像度の算出法: DIFFRACTION PATTERN/LAYERLINES 詳細: Diffraction data were processed with XDS and merged with XSCALE. The structure was solved by molecular replacement with PHASER 2.8.3 and refined with Refmac 5.8.0267, using electron atomic ...詳細: Diffraction data were processed with XDS and merged with XSCALE. The structure was solved by molecular replacement with PHASER 2.8.3 and refined with Refmac 5.8.0267, using electron atomic scattering factors (source electron used in Refmac). 対称性のタイプ: 3D CRYSTAL | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | プロトコル: OTHER | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
精密化 | 解像度: 2.91→54.367 Å / Cor.coef. Fo:Fc: 0.928 / Cor.coef. Fo:Fc free: 0.839 / SU B: 25.859 / SU ML: 0.451 / 交差検証法: FREE R-VALUE / ESU R Free: 0.591 / 詳細: Hydrogens have been added in their riding positions
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溶媒の処理 | イオンプローブ半径: 0.8 Å / 減衰半径: 0.8 Å / VDWプローブ半径: 1.2 Å / 溶媒モデル: MASK BULK SOLVENT | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
原子変位パラメータ | Biso mean: 31.961 Å2
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拘束条件 |
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