- EMDB-6478: Single-particle cryo-electron microscopy reconstruction of the eu... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-6478
タイトル
Single-particle cryo-electron microscopy reconstruction of the eukaryotic large ribosomal subunit
マップデータ
Single-particle cryo-EM reconstruction of the eukaryotic large 60S ribosomal subunit
試料
試料: Saccharomyces cerevisiae large 60S ribosomal subunit
複合体: 60S large ribosomal subunit
キーワード
ribosome / translation
機能・相同性
機能・相同性情報
SRP-dependent cotranslational protein targeting to membrane / GTP hydrolysis and joining of the 60S ribosomal subunit / Nonsense Mediated Decay (NMD) independent of the Exon Junction Complex (EJC) / Nonsense Mediated Decay (NMD) enhanced by the Exon Junction Complex (EJC) / Formation of a pool of free 40S subunits / L13a-mediated translational silencing of Ceruloplasmin expression / ribosomal large subunit assembly / cytosolic large ribosomal subunit / cytoplasmic translation / structural constituent of ribosome ...SRP-dependent cotranslational protein targeting to membrane / GTP hydrolysis and joining of the 60S ribosomal subunit / Nonsense Mediated Decay (NMD) independent of the Exon Junction Complex (EJC) / Nonsense Mediated Decay (NMD) enhanced by the Exon Junction Complex (EJC) / Formation of a pool of free 40S subunits / L13a-mediated translational silencing of Ceruloplasmin expression / ribosomal large subunit assembly / cytosolic large ribosomal subunit / cytoplasmic translation / structural constituent of ribosome / RNA binding / cytosol 類似検索 - 分子機能
: / Ribosomal protein L6e signature. / Ribosomal Protein L6, KOW domain / Ribosomal protein L6e / 60S ribosomal protein L6E / Translation protein SH3-like domain superfamily / Ribosomal protein L2, domain 2 類似検索 - ドメイン・相同性
ジャーナル: J Struct Biol / 年: 2015 タイトル: Single-particle cryoEM analysis at near-atomic resolution from several thousand asymmetric subunits. 著者: Dario Oliveira Passos / Dmitry Lyumkis / 要旨: A single-particle cryoEM reconstruction of the large ribosomal subunit from Saccharomyces cerevisiae was obtained from a dataset of ∼75,000 particles. The gold-standard and frequency-limited ...A single-particle cryoEM reconstruction of the large ribosomal subunit from Saccharomyces cerevisiae was obtained from a dataset of ∼75,000 particles. The gold-standard and frequency-limited approaches to single-particle refinement were each independently used to determine orientation parameters for the final reconstruction. Both approaches showed similar resolution curves and nominal resolution values for the 60S dataset, estimated at 2.9 Å. The amount of over-fitting present during frequency-limited refinement was quantitatively analyzed using the high-resolution phase-randomization test, and the results showed no apparent over-fitting. The number of asymmetric subunits required to reach specific resolutions was subsequently analyzed by refining subsets of the data in an ab initio manner. With our data collection and processing strategies, sub-nanometer resolution was obtained with ∼200 asymmetric subunits (or, equivalently for the ribosomal subunit, particles). Resolutions of 5.6 Å, 4.5 Å, and 3.8 Å were reached with ∼1000, ∼1600, and ∼5000 asymmetric subunits, respectively. At these resolutions, one would expect to detect alpha-helical pitch, separation of beta-strands, and separation of Cα atoms, respectively. Using this map, together with strategies for ab initio model building and model refinement, we built a region of the ribosomal protein eL6, which was missing in previous models of the yeast ribosome. The relevance for more routine high-resolution structure determination is discussed.
凍結剤: ETHANE / チャンバー内湿度: 90 % / チャンバー内温度: 77 K / 装置: HOMEMADE PLUNGER 手法: A 3 uL sample was applied onto a freshly plasma-treated (6 seconds, Gatan Solarus plasma cleaner) holey carbon C-flat grid (Protochips, Inc.), allowing the sample to adsorb for 30 seconds. ...手法: A 3 uL sample was applied onto a freshly plasma-treated (6 seconds, Gatan Solarus plasma cleaner) holey carbon C-flat grid (Protochips, Inc.), allowing the sample to adsorb for 30 seconds. The sample was then plunge-frozen in liquid ethane using a manual cryo-plunger in ambient atmosphere at 4 degrees C.
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電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
アライメント法
Legacy - 非点収差: Objective lens astigmatism was corrected within the Leginon software.