- EMDB-2022: Three-dimensional reconstruction of another targeted individual a... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-2022
タイトル
Three-dimensional reconstruction of another targeted individual antibody particle by individual-particle electron tomography (IPET). The reconstruction displayed three ring-shaped domains that corresponding to three domain of IgG antibody.
マップデータ
Single targeted particle structure reconstructed by focus-EM reconstruction algorithm of individual particle electron tomography method
ジャーナル: PLoS One / 年: 2012 タイトル: IPET and FETR: experimental approach for studying molecular structure dynamics by cryo-electron tomography of a single-molecule structure. 著者: Lei Zhang / Gang Ren / 要旨: The dynamic personalities and structural heterogeneity of proteins are essential for proper functioning. Structural determination of dynamic/heterogeneous proteins is limited by conventional ...The dynamic personalities and structural heterogeneity of proteins are essential for proper functioning. Structural determination of dynamic/heterogeneous proteins is limited by conventional approaches of X-ray and electron microscopy (EM) of single-particle reconstruction that require an average from thousands to millions different molecules. Cryo-electron tomography (cryoET) is an approach to determine three-dimensional (3D) reconstruction of a single and unique biological object such as bacteria and cells, by imaging the object from a series of tilting angles. However, cconventional reconstruction methods use large-size whole-micrographs that are limited by reconstruction resolution (lower than 20 Å), especially for small and low-symmetric molecule (<400 kDa). In this study, we demonstrated the adverse effects from image distortion and the measuring tilt-errors (including tilt-axis and tilt-angle errors) both play a major role in limiting the reconstruction resolution. Therefore, we developed a "focused electron tomography reconstruction" (FETR) algorithm to improve the resolution by decreasing the reconstructing image size so that it contains only a single-instance protein. FETR can tolerate certain levels of image-distortion and measuring tilt-errors, and can also precisely determine the translational parameters via an iterative refinement process that contains a series of automatically generated dynamic filters and masks. To describe this method, a set of simulated cryoET images was employed; to validate this approach, the real experimental images from negative-staining and cryoET were used. Since this approach can obtain the structure of a single-instance molecule/particle, we named it individual-particle electron tomography (IPET) as a new robust strategy/approach that does not require a pre-given initial model, class averaging of multiple molecules or an extended ordered lattice, but can tolerate small tilt-errors for high-resolution single "snapshot" molecule structure determination. Thus, FETR/IPET provides a completely new opportunity for a single-molecule structure determination, and could be used to study the dynamic character and equilibrium fluctuation of macromolecules.
名称: Human IgG Antibody / タイプ: sample / ID: 1000 詳細: The sample was thawed from storage at -80 degrees Celcius before being loaded onto the grid 集合状態: Monomer / Number unique components: 1
生物種: Homo sapiens (ヒト) / 株: IgG / 別称: Human / 細胞中の位置: Plasma
分子量
実験値: 160 KDa / 理論値: 160 KDa
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実験情報
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構造解析
手法
ネガティブ染色法
解析
サブトモグラム平均法
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試料調製
濃度
0.01 mg/mL
緩衝液
pH: 7.4 詳細: 1X Dulbeccos phosphate-buffered saline (Invitrogen, La Jolla, CA), 2.7 mM KCl, 1.46 mM KH2PO4, 136.9 mM NaCl, and 8.1 mM Na2HPO4
染色
タイプ: NEGATIVE 詳細: EM Specimens were prepared by optimized negative-staining EM specimen preparation protocol as described Zhang L. and Ren G, Journal of Lipid Research, (2010) 51, 1228-1236 and (2011) 52, 175- ...詳細: EM Specimens were prepared by optimized negative-staining EM specimen preparation protocol as described Zhang L. and Ren G, Journal of Lipid Research, (2010) 51, 1228-1236 and (2011) 52, 175-84. In brief, antibody was diluted to 0.01 mg/ml with deionized water. Aliquots (about 3ul) were applied to the 200 mesh glow-discharged thin carbon-coated EM grids (Cu-200CN, Pacific Grid-Tech, USA). The grid was washed by deionized water for three times, and then washed by 1% uranyl formate for three times before blotting to drying.
グリッド
詳細: 200 mesh glow-discharged thin carbon-coated EM grids (Cu-200CN, Pacific Grid-Tech, USA)
試料ホルダー: Gatan / 試料ホルダーモデル: OTHER / Tilt series - Axis1 - Min angle: -60 ° / Tilt series - Axis1 - Max angle: 60 °
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画像解析
詳細
Single targeted particle"s images were reconstructed by focus-EM reconstruction algorithm of individual particle electron tomography method. Average number of tilts used in the 3D reconstructions: 81. Average tomographic tilt angle increment: 1.5.
最終 再構成
アルゴリズム: OTHER / 解像度のタイプ: BY AUTHOR / 解像度: 14.6 Å / 解像度の算出法: OTHER / ソフトウェア - 名称: IPET, and, FETR 詳細: Map was reconstructed by individual-particle electron tomography (IPET)and Focus ET Reconstruction Algorithm.
CTF補正
詳細: TOMOCTF
最終 角度割当
詳細: Tomography tilt angle from -60 to 60 in step of 1.5