8BTR の概要
| エントリーDOI | 10.2210/pdb8btr/pdb |
| EMDBエントリー | 16235 |
| 分子名称 | Ribosomal protein L2, Ribosomal protein L6, Ribosomal protein L10, ... (78 entities in total) |
| 機能のキーワード | ribosome, translation, giardia, eukaryote, eukaryotic, macromolecule, trna |
| 由来する生物種 | Giardia lamblia ATCC 50803 詳細 |
| タンパク質・核酸の鎖数 | 78 |
| 化学式量合計 | 2759171.52 |
| 構造登録者 | |
| 主引用文献 | Majumdar, S.,Emmerich, A.,Krakovka, S.,Mandava, C.S.,Svard, S.G.,Sanyal, S. Insights into translocation mechanism and ribosome evolution from cryo-EM structures of translocation intermediates of Giardia intestinalis. Nucleic Acids Res., 51:3436-3451, 2023 Cited by PubMed Abstract: Giardia intestinalis is a protozoan parasite that causes diarrhea in humans. Using single-particle cryo-electron microscopy, we have determined high-resolution structures of six naturally populated translocation intermediates, from ribosomes isolated directly from actively growing Giardia cells. The highly compact and uniquely GC-rich Giardia ribosomes possess eukaryotic rRNAs and ribosomal proteins, but retain some bacterial features. The translocation intermediates, with naturally bound tRNAs and eukaryotic elongation factor 2 (eEF2), display characteristic ribosomal intersubunit rotation and small subunit's head swiveling-universal for translocation. In addition, we observe the eukaryote-specific 'subunit rolling' dynamics, albeit with limited features. Finally, the eEF2·GDP state features a uniquely positioned 'leaving phosphate (Pi)' that proposes hitherto unknown molecular events of Pi and eEF2 release from the ribosome at the final stage of translocation. In summary, our study elucidates the mechanism of translocation in the protists and illustrates evolution of the translation machinery from bacteria to eukaryotes from both the structural and mechanistic perspectives. PubMed: 36912103DOI: 10.1093/nar/gkad176 主引用文献が同じPDBエントリー |
| 実験手法 | ELECTRON MICROSCOPY (3.25 Å) |
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