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基本情報
登録情報 | データベース: PDB / ID: 9cq0 | ||||||||||||
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タイトル | Event-based electron counting microED structure of thiostrepton from a single crystal | ||||||||||||
![]() | Thiostrepton | ||||||||||||
![]() | ANTIBIOTIC / Cyclic / macrocycle | ||||||||||||
機能・相同性 | THIOSTREPTON![]() | ||||||||||||
生物種 | ![]() | ||||||||||||
手法 | 電子線結晶学 / 解像度: 1.5 Å | ||||||||||||
![]() | Vlahakis, N.W. / Qu, S. / Richards, L.S. / deMoraes, L.S. / Nelson, H.M. / Rodriguez, J.A. | ||||||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Fast event-based electron counting for small-molecule structure determination by MicroED. 著者: Niko Vlahakis / Songrong Qu / Logan S Richards / Lygia Silva de Moraes / Duilio Cascio / Hosea M Nelson / Jose A Rodriguez / ![]() 要旨: Electron counting helped realize the resolution revolution in single-particle cryoEM and is now accelerating the determination of MicroED structures. Its advantages are best demonstrated by new ...Electron counting helped realize the resolution revolution in single-particle cryoEM and is now accelerating the determination of MicroED structures. Its advantages are best demonstrated by new direct electron detectors capable of fast (kilohertz) event-based electron counting (EBEC). This strategy minimizes the inaccuracies introduced by coincidence loss (CL) and promises rapid determination of accurate structures. We used the Direct Electron Apollo camera to leverage EBEC technology for MicroED data collection. Given its ability to count single electrons, the Apollo collects high-quality MicroED data from organic small-molecule crystals illuminated with incident electron beam flux densities as low as 0.01-0.045 e/Å/s. Under even the lowest flux density (0.01 e/Å/s) condition, fast EBEC data produced ab initio structures of a salen ligand (268 Da) and biotin (244 Da). Each structure was determined from a 100° wedge of data collected from a single crystal in as few as 50 s, with a delivered fluence of only ∼0.5 e/Å. Fast EBEC data collected with a fluence of 2.25 or 3.33 e/Å also facilitated a 1.5 Å structure of thiostrepton (1665 Da). While refinement of these structures appeared unaffected by CL, a CL adjustment applied to EBEC data further improved the distribution of intensities measured from the salen ligand and biotin crystals. However, CL adjustment only marginally improved the refinement of their corresponding structures, signaling the already high counting accuracy of detectors with counting rates in the kilohertz range. Overall, by delivering low-dose structure-worthy data, fast EBEC collection strategies open new possibilities for high-throughput MicroED. | ||||||||||||
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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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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・ペプチド | ![]() 詳細: Thiostrepton is a hetrocyclic thiopeptide belonging to the thiocillin family, consisting of four thiazole, one thiozoline and one piperideine rings. A modified quinoline linked to main-chain ...詳細: Thiostrepton is a hetrocyclic thiopeptide belonging to the thiocillin family, consisting of four thiazole, one thiozoline and one piperideine rings. A modified quinoline linked to main-chain residue 1 and side-chain of residue 12. Post translational maturation of thiazole and oxazole containing antibiotics involves the enzymic condensation of a Cys or Ser with the alpha-carbonyl of the preceding amino acid to form a thioether or ether bond, then dehydration to form a double bond with the alpha-amino nitrogen. Thiazoline or oxazoline ring are dehydrogenated to form thiazole or oxazole rings. the pyridinyl involves the cross-linking of a Ser and a Cys-Ser pair usually separated by 7 or 8 residues along the peptide chain. The Ser residues are dehydrated to didehydroalanines, then bonded between their beta carbons. The alpha carbonyl of the Cys condenses with alpha carbon of the first Ser to form a pyridinyl ring. The ring may be mutiply dehydrogenated to form a pyridine ring with loss of the amino nitrogen of the first Ser. The amidation of Ser-17 probably does not occur by the same mechanism, oxidative cleavage of glycine, as in eukaryotes. 由来: (天然) ![]() |
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#2: 水 | ChemComp-HOH / |
構成要素の詳細 | THIOSTREPTON IS A MEMBER OF A SULPHUR-RICH HETEROCYCLIC PEPTIDES CLASS. ALL SHARE A MACROCYLIC ...THIOSTREPT |
研究の焦点であるリガンドがあるか | N |
Has protein modification | Y |
-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: Microcrystal of thiostrepton / タイプ: COMPLEX / Entity ID: #1 / 由来: NATURAL |
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分子量 | 値: 1.81 kDa/nm / 実験値: NO |
由来(天然) | 生物種: ![]() |
EM crystal formation | Atmosphere: Standard temperature and pressure 詳細: Thiostrepton (30 mg) was dissolved in 1.95 mL 24:1 Chloroform:Isoamyl Alcohol. 390 uL of Ethanol and 195 uL of 100% Glycerol were each mixed into the solution, and tetragonal crystals of ...詳細: Thiostrepton (30 mg) was dissolved in 1.95 mL 24:1 Chloroform:Isoamyl Alcohol. 390 uL of Ethanol and 195 uL of 100% Glycerol were each mixed into the solution, and tetragonal crystals of various sizes (including microcrystals) formed after approximately 2 days of slow evaporation of the solvent under ambient conditions. 温度: 293 K / Time: 2 DAY |
緩衝液 | pH: 7 / 詳細: 24:1 chloroform/isoamyl alcohol |
試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: NO |
-データ収集
実験機器 | ![]() モデル: Talos Arctica / 画像提供: FEI Company |
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顕微鏡 | モデル: FEI TALOS ARCTICA |
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 / C2レンズ絞り径: 70 µm |
試料ホルダ | 凍結剤: NITROGEN / 最高温度: 100 K / 最低温度: 100 K |
撮影 | 平均露光時間: 3.33 sec. / 電子線照射量: 0.0333 e/Å2 フィルム・検出器のモデル: DIRECT ELECTRON APOLLO (4k x 4k) Num. of diffraction images: 100 / 撮影したグリッド数: 1 |
画像スキャン | 横: 4096 / 縦: 4096 |
EM回折 シェル | 解像度: 1.5→1.6 Å / フーリエ空間範囲: 98.6 % / 多重度: 7.4 / 構造因子数: 289 / 位相残差: 38 ° |
EM回折 統計 | フーリエ空間範囲: 99.3 % / 再高解像度: 1.5 Å / 測定した強度の数: 12605 / 構造因子数: 1738 位相誤差の除外基準: Phases were determined by molecular replacement and cross-validated by free R-value during refinement Rmerge: 20.4 |
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解析
EMソフトウェア |
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画像処理 | 詳細: Images were gain corrected and binned at 4k x 4k pixels. A pedestal of 1 pixel value was applied to each pixel during conversion to SMV file format. | ||||||||||||||||||||||||
EM 3D crystal entity | ∠α: 90 ° / ∠β: 90 ° / ∠γ: 90 ° / A: 26.47 Å / B: 26.47 Å / C: 27.29 Å / 空間群名: P4(3)2(1)2 / 空間群番号: 96 | ||||||||||||||||||||||||
CTF補正 | タイプ: NONE | ||||||||||||||||||||||||
3次元再構成 | 解像度: 1.5 Å / 解像度の算出法: DIFFRACTION PATTERN/LAYERLINES / 対称性のタイプ: 3D CRYSTAL | ||||||||||||||||||||||||
原子モデル構築 | B value: 13.09 | ||||||||||||||||||||||||
原子モデル構築 | PDB-ID: 1E9W Accession code: 1E9W / Source name: PDB / タイプ: experimental model | ||||||||||||||||||||||||
精密化 | 解像度: 1.5→18.72 Å / SU ML: 0.07 / 交差検証法: FREE R-VALUE / σ(F): 1.35 / 位相誤差: 16.39 / 立体化学のターゲット値: ML
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溶媒の処理 | 減衰半径: 0.9 Å / VDWプローブ半径: 1.11 Å / 溶媒モデル: FLAT BULK SOLVENT MODEL | ||||||||||||||||||||||||
拘束条件 |
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LS精密化 シェル | 解像度: 1.5→18.72 Å
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