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A distinct assembly pathway of the human 39S late pre-mitoribosome

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  • Jingdong Cheng

    (LMU Munich)

  • Otto Berninghausen

    (LMU Munich)

  • Roland Beckmann

    (LMU Munich)

Abstract

Assembly of the mitoribosome is largely enigmatic and involves numerous assembly factors. Little is known about their function and the architectural transitions of the pre-ribosomal intermediates. Here, we solve cryo-EM structures of the human 39S large subunit pre-ribosomes, representing five distinct late states. Besides the MALSU1 complex used as bait for affinity purification, we identify several assembly factors, including the DDX28 helicase, MRM3, GTPBP10 and the NSUN4-mTERF4 complex, all of which keep the 16S rRNA in immature conformations. The late transitions mainly involve rRNA domains IV and V, which form the central protuberance, the intersubunit side and the peptidyltransferase center of the 39S subunit. Unexpectedly, we find deacylated tRNA in the ribosomal E-site, suggesting a role in 39S assembly. Taken together, our study provides an architectural inventory of the distinct late assembly phase of the human 39S mitoribosome.

Suggested Citation

  • Jingdong Cheng & Otto Berninghausen & Roland Beckmann, 2021. "A distinct assembly pathway of the human 39S late pre-mitoribosome," Nature Communications, Nature, vol. 12(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-24818-x
    DOI: 10.1038/s41467-021-24818-x
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    Cited by:

    1. Bo Qin & Simon M. Lauer & Annika Balke & Carlos H. Vieira-Vieira & Jörg Bürger & Thorsten Mielke & Matthias Selbach & Patrick Scheerer & Christian M. T. Spahn & Rainer Nikolay, 2023. "Cryo-EM captures early ribosome assembly in action," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    2. Thu Giang Nguyen & Christina Ritter & Eva Kummer, 2023. "Structural insights into the role of GTPBP10 in the RNA maturation of the mitoribosome," Nature Communications, Nature, vol. 14(1), pages 1-12, December.
    3. Pedro Rebelo-Guiomar & Simone Pellegrino & Kyle C. Dent & Aldema Sas-Chen & Leonor Miller-Fleming & Caterina Garone & Lindsey Van Haute & Jack F. Rogan & Adam Dinan & Andrew E. Firth & Byron Andrews &, 2022. "A late-stage assembly checkpoint of the human mitochondrial ribosome large subunit," Nature Communications, Nature, vol. 13(1), pages 1-14, December.

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