Cited by 197RNA and protein synthesis mechanismsMitochondrial Function and PathologyRNA modifications and cancer

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

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Chomyn, Anne, Enriquez, José Antonio, Micol, Vicente, Fernandez-Silva, Patricio, Attardi, Giuseppe·2000·Journal of Biological Chemistry

Abstract

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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  • m.3243A N G impairs correct transcription of 16S mt-rRNA by interfering with a transcription termination site, causing accumulation of RNA19.

    “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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Research works printed but not linked: 5

  1. Chomyn, A., Martinuzzi, A., Yoneda, M., Daga, A., Hurko, O., Johns, D., Lai, S. T., Nonaka, I., Angelini, C., and Attardi, G. (1992) Proc. Natl. Acad. Sci.
  2. Yoneda, M., Chomyn, A., Martinuzzi, A., Hurko, O., and Attardi, G. (1992) Proc. Natl. Acad. Sci. U. S. A. 89, 11164 -11168
  3. Schimmel, P., Giege ´, R., Moras, D., and Yokoyama, S. (1993) Proc. Natl. Acad. Sci. U. S. A. 90, 8763-8768
  4. Hou, Y. M., Westhof, E., and Giege ´, R. (1993) Proc. Natl. Acad. Sci. U. S. A. 90, 6776 -6780
  5. So ¨ll, D. (1993) in The RNA World (Gesteland, R., and Atkins, J., eds) pp. 157-184, Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 49.

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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
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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