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-Structure paper
タイトル | Structure of the mature kinetoplastids mitoribosome and insights into its large subunit biogenesis. |
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ジャーナル・号・ページ | Proc Natl Acad Sci U S A, Vol. 117, Issue 47, Page 29851-29861, Year 2020 |
掲載日 | 2020年11月24日 |
著者 | Heddy Soufari / Florent Waltz / Camila Parrot / Stéphanie Durrieu-Gaillard / Anthony Bochler / Lauriane Kuhn / Marie Sissler / Yaser Hashem / |
PubMed 要旨 | Kinetoplastids are unicellular eukaryotic parasites responsible for such human pathologies as Chagas disease, sleeping sickness, and leishmaniasis. They have a single large mitochondrion, essential ...Kinetoplastids are unicellular eukaryotic parasites responsible for such human pathologies as Chagas disease, sleeping sickness, and leishmaniasis. They have a single large mitochondrion, essential for the parasite survival. In kinetoplastid mitochondria, most of the molecular machineries and gene expression processes have significantly diverged and specialized, with an extreme example being their mitochondrial ribosomes. These large complexes are in charge of translating the few essential mRNAs encoded by mitochondrial genomes. Structural studies performed in already highlighted the numerous peculiarities of these mitoribosomes and the maturation of their small subunit. However, several important aspects mainly related to the large subunit (LSU) remain elusive, such as the structure and maturation of its ribosomal RNA. Here we present a cryo-electron microscopy study of the protozoans and mitoribosomes. For both species, we obtained the structure of their mature mitoribosomes, complete rRNA of the LSU, as well as previously unidentified ribosomal proteins. In addition, we introduce the structure of an LSU assembly intermediate in the presence of 16 identified maturation factors. These maturation factors act on both the intersubunit and the solvent sides of the LSU, where they refold and chemically modify the rRNA and prevent early translation before full maturation of the LSU. |
リンク | Proc Natl Acad Sci U S A / PubMed:33168716 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 3.4 - 3.9 Å |
構造データ | EMDB-11796, PDB-7aih: EMDB-11821, PDB-7am2: EMDB-11829, PDB-7ane: EMDB-11846, PDB-7aor: |
化合物 | ChemComp-ZN: ChemComp-NAD: ChemComp-GTP: ChemComp-ATP: ChemComp-MG: ChemComp-UTP: |
由来 |
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キーワード | RIBOSOME / Mitochondria / Kinetoplastid |