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基本情報
登録情報 | データベース: EMDB / ID: EMD-1073 | |||||||||
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タイトル | Three-dimensional structures of translating ribosomes by Cryo-EM. | |||||||||
![]() | Average difference map calculated between individual difference maps for Ig2 and GFP ribosome-nascent chain complexes (see entries 1068, 1070, 1071, 1072). | |||||||||
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生物種 | ![]() ![]() ![]() ![]() | |||||||||
手法 | 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 16.0 Å | |||||||||
![]() | Gilbert RJC / Fucini P / Connell S / Fuller SD / Nierhaus KH / Robinson CV / Dobson CM / Stuart DI | |||||||||
![]() | ![]() タイトル: Three-dimensional structures of translating ribosomes by Cryo-EM. 著者: Robert J C Gilbert / Paola Fucini / Sean Connell / Stephen D Fuller / Knud H Nierhaus / Carol V Robinson / Christopher M Dobson / David I Stuart / ![]() 要旨: Cryo-electron microscopy and image reconstruction techniques have been used to obtain three-dimensional maps for E. coli ribosomes stalled following translation of three representative proteins. ...Cryo-electron microscopy and image reconstruction techniques have been used to obtain three-dimensional maps for E. coli ribosomes stalled following translation of three representative proteins. Comparisons of these electron density maps, at resolutions of between 13 and 16 A, with that of a nontranslating ribosome pinpoint specific structural differences in stalled ribosomes and identify additional material, including tRNAs and mRNA. In addition, the tunnel through the large subunit, the anticipated exit route of newly synthesized proteins, is partially occluded in all the stalled ribosome structures. This observation suggests that significant segments of the nascent polypeptide chains examined here could be located within an expanded tunnel, perhaps in a rudimentary globular conformation. Such behavior could be an important aspect of the folding of at least some proteins in the cellular environment. | |||||||||
履歴 |
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構造の表示
ムービー |
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構造ビューア | EMマップ: ![]() ![]() ![]() |
添付画像 |
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マップデータ | ![]() | 4.8 MB | ![]() | |
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ヘッダ (付随情報) | ![]() ![]() | 11 KB 11 KB | 表示 表示 | ![]() |
画像 | ![]() | 54.8 KB | ||
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-関連構造データ
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EMDBのページ | ![]() ![]() |
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「今月の分子」の関連する項目 |
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マップ
ファイル | ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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注釈 | Average difference map calculated between individual difference maps for Ig2 and GFP ribosome-nascent chain complexes (see entries 1068, 1070, 1071, 1072). | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
投影像・断面図 | 画像のコントロール
画像は Spider により作成 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
ボクセルのサイズ | X=Y=Z: 3.33 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
密度 |
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対称性 | 空間群: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
詳細 | EMDB XML:
CCP4マップ ヘッダ情報:
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-添付データ
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試料の構成要素
-全体 : E. coli ribosome translating GFP and tandem Ig domains - differen...
全体 | 名称: E. coli ribosome translating GFP and tandem Ig domains - difference map |
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要素 |
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-超分子 #1000: E. coli ribosome translating GFP and tandem Ig domains - differen...
超分子 | 名称: E. coli ribosome translating GFP and tandem Ig domains - difference map タイプ: sample / ID: 1000 / 詳細: The sample was monodisperse. 集合状態: 2 tRNA molecules and the average of two nascent proteins Number unique components: 3 |
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-分子 #1: P site tRNA
分子 | 名称: P site tRNA / タイプ: rna / ID: 1 / 分類: OTHER / Structure: SINGLE STRANDED / Synthetic?: No |
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由来(天然) | 生物種: ![]() ![]() |
-分子 #2: E site tRNA
分子 | 名称: E site tRNA / タイプ: rna / ID: 2 / 分類: OTHER / Structure: SINGLE STRANDED / Synthetic?: No |
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由来(天然) | 生物種: ![]() ![]() |
-分子 #3: nascent protein
分子 | 名称: nascent protein / タイプ: protein_or_peptide / ID: 3 / Name.synonym: GFP-Ig2 詳細: Density for nascent protein is average of that for tandem Ig domains and GFP コピー数: 1 / 集合状態: monomer / 組換発現: Yes |
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由来(天然) | 生物種: ![]() ![]() |
組換発現 | 生物種: ![]() ![]() |
-実験情報
-構造解析
手法 | クライオ電子顕微鏡法 |
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![]() | 単粒子再構成法 |
試料の集合状態 | particle |
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試料調製
濃度 | 5.0 mg/mL |
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緩衝液 | 詳細: 20 mM HEPES, 150 mM ammonium acetate, 6 mM magnesium acetate, 2 mM spermidine, 0.05 mM spermine and 4 mM 2-mercaptoethanol. Concentration of ribosomes expressed to A260 units. |
グリッド | 詳細: 300 mesh copper grid with holey carbon film |
凍結 | 凍結剤: ETHANE / チャンバー内温度: 100 K / 装置: HOMEMADE PLUNGER 詳細: Vitrification instrument: Standard unmodified guillotine plunger |
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電子顕微鏡法
顕微鏡 | FEI/PHILIPS CM200FEG |
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温度 | 平均: 100 K |
日付 | 2000年5月2日 |
撮影 | カテゴリ: FILM / フィルム・検出器のモデル: KODAK SO-163 FILM / デジタル化 - スキャナー: OTHER / デジタル化 - サンプリング間隔: 8.322 µm / 詳細: Scanner model: UMAX PowerLook 3000 / Od range: 5 / ビット/ピクセル: 8 |
電子線 | 加速電圧: 200 kV / 電子線源: ![]() |
電子光学系 | 照射モード: OTHER / 撮影モード: OTHER / Cs: 2 mm / 倍率(公称値): 50000 |
試料ステージ | 試料ホルダー: Eucentric / 試料ホルダーモデル: GATAN LIQUID NITROGEN |
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画像解析
CTF補正 | 詳細: Each negative dataset |
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最終 再構成 | 想定した対称性 - 点群: C1 (非対称) / アルゴリズム: OTHER / 解像度のタイプ: BY AUTHOR / 解像度: 16.0 Å / 解像度の算出法: FSC 0.5 CUT-OFF ソフトウェア - 名称: SPIDER, IMAGIC, GAP, CNS, XPLOR 詳細: See entries 1068, 1070, 1071 and 1072. Vector difference maps were calculated between reconstructions of each nascent protein-ribosome complex and the control inactive map. The difference ...詳細: See entries 1068, 1070, 1071 and 1072. Vector difference maps were calculated between reconstructions of each nascent protein-ribosome complex and the control inactive map. The difference densities for the tandem Ig domains and GFP nascent proteins were more similar to each other than either was to the single Ig domain nascent protein. Therefore these two difference maps were averaged together to produce a set of consensus difference densities representing the main differences between inactive ribosomes and ribosomes stalled during translation that contain a nascent polypeptide chain. |
最終 角度割当 | 詳細: SPIDER euler |
-原子モデル構築 1
ソフトウェア | 名称: GAP |
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詳細 | Protocol: Rigid body |
精密化 | 空間: REAL / プロトコル: RIGID BODY FIT 当てはまり具合の基準: R-factor and correlation coefficient |