9hm0

Translational activator Aep3 in complex with mRNA and the yeast mitochondrial ribosome

spinqualitylabelsall models 9hm0, resolution 3.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 9hm0 is a 10 chain structure with sequence from Saccharomyces cerevisiae W303. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 3Å Ligands: GTP, MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function COX24_YEAST Involved in the splicing of the COX1 mRNA. Publication Abstract from PubMed 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. Translational activators align mRNAs at the small mitoribosomal subunit for translation initiation.,Bridgers JB, Carlstrom A, Sherpa D, Couvillion MT, Rovsnik U, Gao J, Wan B, Shao S, Ott M, Churchman LS Nat Struct Mol Biol. 2025 Dec 3. doi: 10.1038/s41594-025-01726-y. PMID:41339860 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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