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Structural basis of mitochondrial translation.

Shintaro Aibara1, Vivek Singh1,2, Angelika Modelska3

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Summary

This study reveals how human mitoribosomes bind mitochondrial messenger RNA (mt-mRNA) and move transfer RNA (mt-tRNA) during translation. Key proteins like LRPPRC-SLIRP and mS39 facilitate mt-mRNA delivery, while mL40, mL48, and mL64 coordinate mt-tRNA movement.

Keywords:
RNAcryo-EMgene expressionhumanmitochondriamolecular biophysicsribosomestructural biologytranslation

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Mitochondrial Biology

Background:

  • Mitochondrial translation relies on specialized mitoribosomes with unique proteins.
  • The precise roles of these proteins in messenger RNA (mRNA) binding and transfer RNA (tRNA) translocation remain largely unknown.

Purpose of the Study:

  • To elucidate the structural mechanisms of human mitochondrial translation.
  • To visualize the interactions between mitoribosomes, mRNA, tRNA, and associated factors.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) was used to determine the structure of the human mitoribosome.
  • Multiple structures of functional complexes were resolved at approximately 3.0 Å resolution.

Main Results:

  • A protein module (LRPPRC-SLIRP) delivers mitochondrial mRNA (mt-mRNA) to the small ribosomal subunit via a platform formed by mS39.
  • Mitoribosomal proteins mL40, mL48, and mL64 are crucial for coordinating mitochondrial tRNA (mt-tRNA) translocation.
  • Dynamic interactions and sequential conformational changes were observed during translation.

Conclusions:

  • The study provides a detailed structural basis for human mitochondrial translation.
  • Identifies specific protein players and mechanisms involved in mt-mRNA binding and mt-tRNA translocation.
  • Reveals a dynamic, stepwise process governing mitochondrial protein synthesis.