ジャーナル: Cell / 年: 2014 タイトル: Regulation of the mammalian elongation cycle by subunit rolling: a eukaryotic-specific ribosome rearrangement. 著者: Tatyana V Budkevich / Jan Giesebrecht / Elmar Behrmann / Justus Loerke / David J F Ramrath / Thorsten Mielke / Jochen Ismer / Peter W Hildebrand / Chang-Shung Tung / Knud H Nierhaus / Karissa ...著者: Tatyana V Budkevich / Jan Giesebrecht / Elmar Behrmann / Justus Loerke / David J F Ramrath / Thorsten Mielke / Jochen Ismer / Peter W Hildebrand / Chang-Shung Tung / Knud H Nierhaus / Karissa Y Sanbonmatsu / Christian M T Spahn / 要旨: The extent to which bacterial ribosomes and the significantly larger eukaryotic ribosomes share the same mechanisms of ribosomal elongation is unknown. Here, we present subnanometer resolution ...The extent to which bacterial ribosomes and the significantly larger eukaryotic ribosomes share the same mechanisms of ribosomal elongation is unknown. Here, we present subnanometer resolution cryoelectron microscopy maps of the mammalian 80S ribosome in the posttranslocational state and in complex with the eukaryotic eEF1A⋅Val-tRNA⋅GMPPNP ternary complex, revealing significant differences in the elongation mechanism between bacteria and mammals. Surprisingly, and in contrast to bacterial ribosomes, a rotation of the small subunit around its long axis and orthogonal to the well-known intersubunit rotation distinguishes the posttranslocational state from the classical pretranslocational state ribosome. We term this motion "subunit rolling." Correspondingly, a mammalian decoding complex visualized in substates before and after codon recognition reveals structural distinctions from the bacterial system. These findings suggest how codon recognition leads to GTPase activation in the mammalian system and demonstrate that in mammalia subunit rolling occurs during tRNA selection.
全体 : Codon recognition /GTPase activated state of mammalian 80S ribosome
全体
名称: Codon recognition /GTPase activated state of mammalian 80S ribosome
要素
試料: Codon recognition /GTPase activated state of mammalian 80S ribosome
複合体: Re-associated 80S
RNA: transfer RNA
RNA: transfer RNA
RNA: transfer RNA
RNA: messenger RNA
タンパク質・ペプチド: elongation factor 1A
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超分子 #1000: Codon recognition /GTPase activated state of mammalian 80S ribosome
超分子
名称: Codon recognition /GTPase activated state of mammalian 80S ribosome タイプ: sample / ID: 1000 詳細: 80S were re-associated and the sample was assembled in vitro from individual components 集合状態: one 80S binds three tRNAs, one elongation factor eEF1A and one mRNA Number unique components: 6
分子量
理論値: 4.5 MDa
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超分子 #1: Re-associated 80S
超分子
名称: Re-associated 80S / タイプ: complex / ID: 1 / Name.synonym: 80S ribosome / 組換発現: No / Ribosome-details: ribosome-eukaryote: ALL
Acceptor stem loop (2XQD) and tRNA body (1TTT) (cutting points 26-27, 43-44) were docked separately as rigid bodies. Cutting points were restored using Coot.
精密化
空間: REAL / プロトコル: RIGID BODY FIT / 当てはまり具合の基準: correlation
得られたモデル
PDB-4cxh: Regulation of the mammalian elongation cycle by 40S subunit rolling: a eukaryotic-specific ribosome rearrangement
Acceptor stem loop (2XQD) and tRNA body (1TTT) (cutting points 26-27, 43-44) were docked separately as rigid bodies. Cutting points were restored using Coot.
精密化
空間: REAL / プロトコル: RIGID BODY FIT / 当てはまり具合の基準: correlation
得られたモデル
PDB-4cxh: Regulation of the mammalian elongation cycle by 40S subunit rolling: a eukaryotic-specific ribosome rearrangement