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-Structure paper
タイトル | Energy barriers and driving forces in tRNA translocation through the ribosome. |
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ジャーナル・号・ページ | Nat Struct Mol Biol, Vol. 20, Issue 12, Page 1390-1396, Year 2013 |
掲載日 | 2013年11月3日 |
著者 | Lars V Bock / Christian Blau / Gunnar F Schröder / Iakov I Davydov / Niels Fischer / Holger Stark / Marina V Rodnina / Andrea C Vaiana / Helmut Grubmüller / |
PubMed 要旨 | During protein synthesis, tRNAs move from the ribosome's aminoacyl to peptidyl to exit sites. Here we investigate conformational motions during spontaneous translocation, using molecular dynamics ...During protein synthesis, tRNAs move from the ribosome's aminoacyl to peptidyl to exit sites. Here we investigate conformational motions during spontaneous translocation, using molecular dynamics simulations of 13 intermediate-translocation-state models obtained by combining Escherichia coli ribosome crystal structures with cryo-EM data. Resolving fast transitions between states, we find that tRNA motions govern the transition rates within the pre- and post-translocation states. Intersubunit rotations and L1-stalk motion exhibit fast intrinsic submicrosecond dynamics. The L1 stalk drives the tRNA from the peptidyl site and links intersubunit rotation to translocation. Displacement of tRNAs is controlled by 'sliding' and 'stepping' mechanisms involving conserved L16, L5 and L1 residues, thus ensuring binding to the ribosome despite large-scale tRNA movement. Our results complement structural data with a time axis, intrinsic transition rates and molecular forces, revealing correlated functional motions inaccessible by other means. |
リンク | Nat Struct Mol Biol / PubMed:24186064 |
手法 | EM (単粒子) |
解像度 | 9 - 20.0 Å |
構造データ | EMDB-2472: Energy barriers and driving forces of tRNA translocation through the ribosome EMDB-2473: Energy barriers and driving forces of tRNA translocation through the ribosome EMDB-2474: Energy barriers and driving forces of tRNA translocation through the ribosome EMDB-2475: Energy barriers and driving forces of tRNA translocation through the ribosome PDB-4v6y: PDB-4v70: PDB-4v71: PDB-4v72: PDB-4v74: PDB-4v75: PDB-4v76: PDB-4v79: PDB-4v7a: |
化合物 | ChemComp-VAL: ChemComp-FME: |
由来 |
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キーワード | RIBOSOME / cryo-EM refinement / tRNA / translocation intermediate |