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Analysis of translating mitoribosome reveals functional characteristics of translation in mitochondria of fungi

Author

Listed:
  • Yuzuru Itoh

    (Stockholm University
    Department of Medical Biochemistry and Biophysics, Karolinska Institutet)

  • Andreas Naschberger

    (Stockholm University)

  • Narges Mortezaei

    (Stockholm University)

  • Johannes M. Herrmann

    (University of Kaiserslautern)

  • Alexey Amunts

    (Stockholm University
    Department of Medical Biochemistry and Biophysics, Karolinska Institutet)

Abstract

Mitoribosomes are specialized protein synthesis machineries in mitochondria. However, how mRNA binds to its dedicated channel, and tRNA moves as the mitoribosomal subunit rotate with respect to each other is not understood. We report models of the translating fungal mitoribosome with mRNA, tRNA and nascent polypeptide, as well as an assembly intermediate. Nicotinamide adenine dinucleotide (NAD) is found in the central protuberance of the large subunit, and the ATPase inhibitory factor 1 (IF1) in the small subunit. The models of the active mitoribosome explain how mRNA binds through a dedicated protein platform on the small subunit, tRNA is translocated with the help of the protein mL108, bridging it with L1 stalk on the large subunit, and nascent polypeptide paths through a newly shaped exit tunnel involving a series of structural rearrangements. An assembly intermediate is modeled with the maturation factor Atp25, providing insight into the biogenesis of the mitoribosomal large subunit and translation regulation.

Suggested Citation

  • Yuzuru Itoh & Andreas Naschberger & Narges Mortezaei & Johannes M. Herrmann & Alexey Amunts, 2020. "Analysis of translating mitoribosome reveals functional characteristics of translation in mitochondria of fungi," Nature Communications, Nature, vol. 11(1), pages 1-10, December.
  • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-18830-w
    DOI: 10.1038/s41467-020-18830-w
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    Cited by:

    1. Florent Waltz & Thalia Salinas-Giegé & Robert Englmeier & Herrade Meichel & Heddy Soufari & Lauriane Kuhn & Stefan Pfeffer & Friedrich Förster & Benjamin D. Engel & Philippe Giegé & Laurence Drouard &, 2021. "How to build a ribosome from RNA fragments in Chlamydomonas mitochondria," Nature Communications, Nature, vol. 12(1), pages 1-15, December.
    2. Victor Tobiasson & Ieva Berzina & Alexey Amunts, 2022. "Structure of a mitochondrial ribosome with fragmented rRNA in complex with membrane-targeting elements," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    3. Vivek Singh & Yuzuru Itoh & Samuel Del’Olio & Asem Hassan & Andreas Naschberger & Rasmus Kock Flygaard & Yuko Nobe & Keiichi Izumikawa & Shintaro Aibara & Juni Andréll & Paul C. Whitford & Antoni Barr, 2024. "Mitoribosome structure with cofactors and modifications reveals mechanism of ligand binding and interactions with L1 stalk," Nature Communications, Nature, vol. 15(1), pages 1-22, December.

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