ジャーナル: J Mol Biol / 年: 2008 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.
名称: 80S.eEF2.AlF4.GDP / タイプ: sample / ID: 1000 詳細: GDP-AlF4- traps ribosome-bound eEF2 in a transition state of GTP hydrolysis Number unique components: 4
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超分子 #1: 80S ribosome
超分子
名称: 80S ribosome / タイプ: complex / ID: 1 / 組換発現: No / データベース: NCBI / Ribosome-details: ribosome-eukaryote: ALL
由来(天然)
生物種: Thermomyces lanuginosus (菌類)
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実験情報
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構造解析
手法
クライオ電子顕微鏡法
解析
単粒子再構成法
試料の集合状態
particle
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試料調製
緩衝液
pH: 7.2 / 詳細: 20 mM Hepes-NH3, 100 mM KCl, 20 mM MgCl2
グリッド
詳細: Quantifoil grid
凍結
凍結剤: ETHANE / チャンバー内湿度: 90 % / チャンバー内温度: 93 K / 装置: OTHER / 詳細: Vitrification instrument: vitrobot