Primary Citation of Related Structures: 9HLZ, 9HM0
PubMed Abstract:
Mitochondrial gene expression is essential for oxidative phosphorylation. Mitochondrial-encoded mRNAs are translated by dedicated mitochondrial ribosomes (mitoribosomes), whose regulation remains elusive. In Saccharomyces cerevisiae, nuclear-encoded mitochondrial translational activators (TAs) facilitate transcript-specific translation by a yet unknown mechanism. Here, we investigated the function of TAs containing RNA-binding pentatricopeptide repeats using selective mitoribosome profiling and cryo-electron microscopy (cryo-EM) structural analysis. These analyses show that TAs exhibit strong selectivity for mitoribosomes initiating on their target transcripts. Moreover, TA-mitoribosome footprints indicate that TAs recruit mitoribosomes proximal to the start codon. Two cryo-EM structures of mRNA-TA complexes bound to mitoribosomes stalled in the post-initiation, pre-elongation state revealed the general mechanism of TA action. Specifically, the TAs bind to structural elements in the 5' untranslated region of the client mRNA and the mRNA channel exit to align the mRNA in the small subunit during initiation. Our findings provide a mechanistic basis for understanding how mitochondria achieve transcript-specific translation initiation without relying on general sequence elements to position mitoribosomes at start codons.
Organizational Affiliation:
Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA, USA.
Department of Biochemistry and Biophysics, Stockholm University, Stockholm, Sweden.
Department of Medical Biochemistry and Cell Biology, Institute of Biomedicine, University of Gothenburg, Gothenburg, Sweden.
Department of Cell Biology, Harvard Medical School, Boston, MA, USA.
Department of Cell Biology, Harvard Medical School, Boston, MA, USA. sichen_shao@hms.harvard.edu.
Howard Hughes Medical Institute, Chevy Chase, MD, USA. sichen_shao@hms.harvard.edu.
Department of Biochemistry and Biophysics, Stockholm University, Stockholm, Sweden. martin.ott@gu.se.
Department of Medical Biochemistry and Cell Biology, Institute of Biomedicine, University of Gothenburg, Gothenburg, Sweden. martin.ott@gu.se.
Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA, USA. churchman@genetics.med.harvard.edu.
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