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The Mitochondrial Myopathy, Encephalopathy, Lactic Acidosis, and Stroke-like Episode Syndrome-associated Human Mitochondrial tRNALeu(UUR) Mutation Causes Aminoacylation Deficiency and Concomitant Reduced Association of mRNA with Ribosomes
Open accessAbstract
The pathogenetic mechanism of the mitochondrial tRNA(Leu(UUR)) A3243G transition associated with the mitochondrial myopathy, encephalopathy, lactic acidosis, and stroke-like episodes (MELAS) syndrome has been investigated in transmitochondrial cell lines constructed by transfer of mutant mitochondrial DNA (mtDNA)-carrying mitochondria from three genetically unrelated MELAS patients or of isogenic wild-type mtDNA-carrying organelles into human mtDNA-less cells. An in vivo footprinting analysis of the mtDNA segment within the tRNA(Leu(UUR)) gene that binds the transcription termination factor failed to reveal any difference in occupancy of sites or qualitative interaction with the protein between mutant and wild-type mtDNAs. Cell lines nearly homoplasmic for the mutation exhibited a strong (70-75%) reduction in the level of aminoacylated tRNA(Leu(UUR)) and a decrease in mitochondrial protein synthesis rate. The latter, however, did not show any significant correlation between synthesis defect of the individual polypeptides and number or proportion of UUR codons in their mRNAs, suggesting that another step, other than elongation, may be affected. Sedimentation analysis in sucrose gradient showed a reduction in size of the mitochondrial polysomes, while the distribution of the two rRNA components and of the mRNAs revealed decreased association of mRNA with ribosomes and, in the most affected cell line, pronounced degradation of the mRNA associated with slowly sedimenting structures. Therefore, several lines of evidence indicate that the protein synthesis defect in A3243G MELAS mutation-carrying cells is mainly due to a reduced association of mRNA with ribosomes, possibly as a consequence of the tRNA(Leu(UUR)) aminoacylation defect.
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“Correct transcription of 16S mt-rRNA is impaired by the common mt-tRNA Leu(UUR) m.3243A N G mutation, which interferes with a transcription termination site located at the boundary of the 16S mt-rRNA and mt-tRNA Leu(UUR) genes, causing accumulation of an unprocessed RNA intermediate (RNA19) including 16S mt-rRNA, mt-tRNA Leu(UUR) and MTND1 [191][192][193].”
From Mitochondrial DNA mutations and human disease (2010) · cites this paper as [193]
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Metadata
- Authors
- Chomyn, A., Enriquez, J. A., Micol, V., Fernandez-Silva, P., & Attardi, G.
- Affiliations
- California Institute of Technology (US)
- Corresponding author
- Chomyn, Anne
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 2000-06
- Volume
- 275
- Issue
- 25
- Pages
- 19198-19209
- ISSN
- 0021-9258 (ISSN-L)
- OpenAlex
- W2124207622
- Cited by
- 197
- References
- 60
- Citations by year
- 2026: 2 · 2025: 2 · 2024: 9 · 2023: 8 · 2022: 2 · 2021: 8 · 2020: 4 · 2019: 5 · 2018: 6 · 2017: 8 · 2016: 5 · 2015: 9 · 2014: 6 · 2013: 9 · 2012: 9
- FWCI
- 3.86
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Journal of Biological Chemistry (publishedVersion, cc-by)
- PubMed (publishedVersion)
- CaltechAUTHORS (California Institute of Technology) (submittedVersion)
- Funders
- National Institutes of Health (GM-11726)
- National Institute of General Medical Sciences (GM11726)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA modifications and cancer
- Keywords
- MELAS, mitochondrial translation, mitochondrial myopathy, mitochondrial DNA, mRNA degradation, transcription termination factor
- MeSH terms
- Acylation, Base Sequence, Cell Line, DNA, Mitochondrial, DNA, Ribosomal, Humans, Mitochondria, Mutation, Ribosomes, RNA, Messenger, RNA, Transfer, Leu, Protein Biosynthesis, MELAS Syndrome, DNA Footprinting
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