ArticleNature communications2026
Mechanisms of human mitochondrial leaderless mRNA translation initiation.
Article in Nature communications, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Mitochondrial translation is essential for cellular function, and its dysregulation is associated with mitochondrial disorders and cancer. However, the mechanisms by which human mitochondrial ribosomes initiate translation remain poorly understood, particularly because mitochondrial mRNAs generally lack the 5' untranslated regions that guide translation initiation in bacterial and cytoplasmic systems. Using real-time single-molecule fluorescence measurements, biochemical assays, and cryo-EM analysis, we show that human mitochondrial translation initiation occurs through two parallel pathways. In one pathway, leaderless mRNA first loads onto the 28S small subunit, followed by recruitment of the 39S large subunit to form the 55S initiation complex. In the second pathway, a preassembled 55S monosome directly loads onto leaderless mRNA. Both pathways require recruitment of mtIF2 and fMet-tRNA
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