Cited by 31RNA and protein synthesis mechanismsDNA and Nucleic Acid ChemistryRNA modifications and cancer

Structural probing of a pathogenic tRNA dimer

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ROY, MARC D., WITTENHAGEN, LISA M., KELLEY, SHANA O.·2005·RNA

Abstract

The A3243G mutation within the human mitochondrial (hs mt) tRNALeuUUR gene is associated with maternally inherited deafness and diabetes (MIDD) and other mitochondrial encephalopathies. One of the most pronounced structural effects of this mutation is the disruption of the native structure through stabilization of a high-affinity dimeric complex. We conducted a series of studies that address the structural properties of this tRNA dimer, and we assessed its formation under physiological conditions. Enzymatic probing was used to directly define the dimeric interface for the complex, and a discrete region of the D-stem and loop of hs mt tRNALeuUUR was identified. The dependence of dimerization on magnesium ions and temperature was also tested. The formation of the tRNA dimer is influenced by temperature, with dimerization becoming more efficient at physiological temperature. Complexation of the mutant tRNA is also affected by the amount of magnesium present, and occurs at concentrations present intracellularly. Terbium probing experiments revealed a specific metal ion-binding site localized at the site of the A3243G mutation that is unique to the dimer structure. This metal ion-binding site presents a striking parallel to dimeric complexes of viral RNAs, which use the same hexanucleotide sequence for complexation and feature a similarly positioned metal ion-binding site within the dimeric structure. Taken together, these results indicate that the unique dimeric complex formed by the hs mt tRNALeuUUR A3243G mutant exhibits interesting similarities to biological RNA dimers, and may play a role in the loss of function caused by this mutation in vivo.

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  • m.3243A N G disrupts the L-shaped tertiary fold of mt-tRNA Leu(UUR) by preventing A14/U8 interaction.

    “whereas m.3243A N G, in the DHU stem, is responsible for a dramatic structural change, which disrupts both the L-shaped tertiary fold of mt-tRNA Leu(UUR) by preventing np A14/U8 interaction [200]”

    From Mitochondrial DNA mutations and human disease (2010) · cites this paper as [200]

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  • Mitochondrial DNA mutations and human disease

    Tuppen, H. A. L., Blakely, E. L., Turnbull, D. M., & Taylor, R. W. (2010) · Biochimica et Biophysica Acta (BBA) - Bioenergetics · doi:10.1016/j.bbabio.2009.09.005 · Cited by 676 · see citing works

    “3243ANG, in the DHU stem, is responsible for a dramatic structural change, which disrupts both the L-shaped tertiary fold of mt-tRNA by preventing np A14/U8 interaction [200] and its quaternary structure by promoting the formation of a dimeric complex by intermolecular D-loop base pairing [201].”
    Background

Authors
ROY, M. D., WITTENHAGEN, L. M., & KELLEY, S. O.
Affiliations
Boston College (US)
Venue
RNA
Published
2005-02-08
Volume
11
Issue
3
Pages
254-260
ISSN
  • 1355-8382 (ISSN-L)
  • 1469-9001
OpenAlex
W2145657918
Cited by
31
References
49
Citations by year
2025: 1 · 2022: 2 · 2021: 1 · 2020: 1 · 2017: 2 · 2016: 2 · 2015: 1 · 2013: 4 · 2012: 4
FWCI
0.63
Type
journal article
Language
en
Open access
Locations
  • RNA (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • HighWire Press Open Archive (submittedVersion)
Funders
  • National Institutes of Health (1r01gm063890-01a2)
  • National Institute of General Medical Sciences (R01 GM063890, GM063980-01A2)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA and Nucleic Acid Chemistry
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA modifications and cancer
Keywords
mitochondrial tRNA, A3243G mutation, mitochondrial encephalopathy, D-stem, magnesium binding, metal binding sites, RNA dimerization, temperature dependence, RNA structure
MeSH terms
Base Sequence, Electrophoresis, Polyacrylamide Gel, Humans, Magnesium, Nucleic Acid Conformation, RNA, Transfer, Leu, Temperature, Terbium, Molecular Probes, Dimerization

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