A pathogenic point mutation reduces stability of mitochondrial mutant tRNA(Ile).

Abstract:

:Point mutations in mitochondrial tRNA genes are responsible for individual subgroups of mitochondrial encephalomyopathies. We have recently reported that point mutations in the tRNA(Leu)(UUR) and tRNA(Lys) genes cause a defect in the normal modification at the first nucleotide of the anticodon. As part of a systematic analysis of pathogenic mutant mitochondrial tRNAs, we purified tRNA(Ile) with a point mutation at nucleotide 4269 to determine its nucleotide sequence, including modified nucleotides. We found that, instead of causing a defect in the post-transcriptional modification, a pathogenic point mutation in the mitochondrial tRNA(Ile) reduced the stability of the mutant tRNA molecule, resulting in a low steady-state level of aminoacyl-tRNA. The reduced stability was confirmed by examining the life-span of the mutant tRNA(Ile) both in vitro and in vivo, as well as by monitoring its melting profile. Our finding indicates that the mutant tRNA(Ile) itself is intrinsically unstable.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Yasukawa T,Hino N,Suzuki T,Watanabe K,Ueda T,Ohta S

doi

10.1093/nar/28.19.3779

keywords:

subject

Has Abstract

pub_date

2000-10-01 00:00:00

pages

3779-84

issue

19

eissn

0305-1048

issn

1362-4962

journal_volume

28

pub_type

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