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基本情報
登録情報 | データベース: PDB / ID: 3dwu | ||||||
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タイトル | Transition-state model conformation of the switch I region fitted into the cryo-EM map of the eEF2.80S.AlF4.GDP complex | ||||||
![]() | Elongation factor Tu-B | ||||||
![]() | BIOSYNTHETIC PROTEIN / Transition state / conserved switch I / Antibiotic resistance / Elongation factor / GTP-binding / Membrane / Methylation / Nucleotide-binding / Phosphoprotein / Protein biosynthesis | ||||||
機能・相同性 | ![]() protein-synthesizing GTPase / translation elongation factor activity / GTPase activity / GTP binding / cytosol 類似検索 - 分子機能 | ||||||
生物種 | ![]() ![]() | ||||||
手法 | 電子顕微鏡法 / 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 12.6 Å | ||||||
![]() | Nissen, P. / Nyborg, J. / Kjeldgaard, M. | ||||||
![]() | ![]() タイトル: Visualization of the eEF2-80S ribosome transition-state complex by cryo-electron microscopy. 著者: Jayati Sengupta / Jakob Nilsson / Richard Gursky / Morten Kjeldgaard / Poul Nissen / Joachim Frank / ![]() 要旨: In an attempt to understand ribosome-induced GTP hydrolysis on eEF2, we determined a 12.6-A cryo-electron microscopy reconstruction of the eEF2-bound 80S ribosome in the presence of aluminum ...In an attempt to understand ribosome-induced GTP hydrolysis on eEF2, we determined a 12.6-A cryo-electron microscopy reconstruction of the eEF2-bound 80S ribosome in the presence of aluminum tetrafluoride and GDP, with aluminum tetrafluoride mimicking the gamma-phosphate during hydrolysis. This is the first visualization of a structure representing a transition-state complex on the ribosome. Tight interactions are observed between the factor's G domain and the large ribosomal subunit, as well as between domain IV and an intersubunit bridge. In contrast, some of the domains of eEF2 implicated in small subunit binding display a large degree of flexibility. Furthermore, we find support for a transition-state model conformation of the switch I region in this complex where the reoriented switch I region interacts with a conserved rRNA region of the 40S subunit formed by loops of the 18S RNA helices 8 and 14. This complex is structurally distinct from the eEF2-bound 80S ribosome complexes previously reported, and analysis of this map sheds light on the GTPase-coupled translocation mechanism. | ||||||
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構造の表示
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構造ビューア | 分子: ![]() ![]() |
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-関連構造データ
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リンク
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集合体
登録構造単位 | ![]()
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要素
#1: タンパク質・ペプチド | 分子量: 4949.441 Da / 分子数: 1 / 断片: Switch I region: UNP residues 21-66 / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() |
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-実験情報
-実験
実験 | 手法: 電子顕微鏡法 |
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EM実験 | 試料の集合状態: PARTICLE / 3次元再構成法: 単粒子再構成法 |
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試料調製
構成要素 | 名称: eEF2.80S.AlF4.GDP complex / タイプ: RIBOSOME |
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緩衝液 | 名称: 20 mM Hepes-NH3, 100 mM KCl, 20 mM MgCl2 / pH: 7.2 / 詳細: 20 mM Hepes-NH3, 100 mM KCl, 20 mM MgCl2 |
試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
急速凍結 | 装置: FEI VITROBOT MARK I / 凍結剤: NITROGEN 詳細: Cryogen ETHANE (93K), two-face blotting for 1 second |
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電子顕微鏡撮影
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 |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 50000 X / 倍率(補正後): 49650 X / 最大 デフォーカス(公称値): 4500 nm / 最小 デフォーカス(公称値): 1500 nm |
撮影 | 電子線照射量: 10 e/Å2 / 詳細: Kodak SO163 film |
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解析
EMソフトウェア |
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CTF補正 | 詳細: segregation in defocus groups and correction in volumes | ||||||||||||
対称性 | 点対称性: C1 (非対称) | ||||||||||||
3次元再構成 | 手法: SPIDER / 解像度: 12.6 Å / 解像度の算出法: FSC / 粒子像の数: 28242 / ピクセルサイズ(公称値): 2.82 Å 詳細: Single particle reconstruction, resolution estimated: FSC cut-off at 0.15 対称性のタイプ: POINT | ||||||||||||
原子モデル構築 | プロトコル: RIGID BODY FIT / 空間: REAL / Target criteria: correlation coefficient 詳細: METHOD--manual REFINEMENT PROTOCOL--Fitted as rigid body. Current model was aligned to the helix A of the fitted eEF2 coordinates (PDB entry 3DNY) which is located next to the switch I ...詳細: METHOD--manual REFINEMENT PROTOCOL--Fitted as rigid body. Current model was aligned to the helix A of the fitted eEF2 coordinates (PDB entry 3DNY) which is located next to the switch I sequence. The coordinates for this entry are based on manual fitting of the coordinates into cryo-EM density map. Therefore, authors did not deposit structure factors. | ||||||||||||
原子モデル構築 | PDB-ID: 3DNY Accession code: 3DNY / Source name: PDB / タイプ: experimental model | ||||||||||||
精密化ステップ | サイクル: LAST
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