ArticleNucleic acids research2024
Taurine hypomodification underlies mitochondrial tRNATrp-related genetic diseases.
Article in Nucleic acids research, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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Who cites it
6 citing papers in PubMed.
- Mitochondrial drivers of stem cell aging and inflammaging.npj aging · 2026Review
- tRNA modifications in cancer: from molecular mechanisms to clinical translation.Biomarker research · 2026Review
- Molecular pathogenesis and gene therapy-based intervention of GTPBP3-related mitochondrial disease.Nature communications · 2026Article
- SLC6A6 imports taurine into mitochondria to sustain mitochondrial translation and tumour growth.Nature metabolism · 2026Article
- Regulation of RNA-binding proteins by small biomolecules.Nature reviews. Molecular cell biology · 2026Review
- ENSURE: the encyclopedia of suppressor tRNA with an AI assistant.Nucleic acids research · 2026Article
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Authors and funding
8 authors.
Funding
Abstract
Escherichia coli MnmE and MnmG form a complex (EcMnmEG), generating transfer RNA (tRNA) 5-carboxymethylaminomethyluridine (cmnm5U) modification. Both cmnm5U and equivalent 5-taurinomethyluridine (τm5U, catalyzed by homologous GTPBP3 and MTO1) are found at U34 in several human mitochondrial tRNAs (hmtRNAs). Certain mitochondrial DNA (mtDNA) mutations, including m.3243A > G in tRNALeu(UUR) and m.8344A > G in tRNALys, cause genetic diseases, partially due to τm5U hypomodification. However, whether other mtDNA variants in different tRNAs cause a defect in τm5U biogenesis remains unknown. Here, we purified naturally assembled EcMnmEG from E. coli. Notably, EcMnmEG was able to incorporate both cmnm5U and τm5U into hmtRNATrp (encoded by MT-TW), providing a valuable basis for directly monitoring the effects of mtDNA mutations on U34 modification. In vitro, several clinical hmtRNATrp pathogenic mutations caused U34 hypomodification. A patient harboring an m.5541C > T mutation exhibited hmtRNATrp τm5U hypomodification. Moreover, using mtDNA base editing, we constructed two cell lines carrying m.5532G > A or m.5545C > T mutations, both of which exhibited hmtRNATrp τm5U hypomodification. Taurine supplementation improved mitochondrial translation in patient cells. Our findings describe the third hmtRNA species with mutation-related τm5U-hypomodification and provide new insights into the pathogenesis and intervention strategy for hmtRNATrp-related genetic diseases.
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