Decreased CCA-addition in human mitochondrial tRNAs bearing a pathogenic A4317G or A10044G mutation

Yukihide Tomari, Narumi Hino, Takashi Nagaike, Tsutomu Suzuki, Takuya Ueda

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26 Citations (Scopus)

Abstract

Pathogenic point mutations in mitochondrial tRNA genes are known to cause a variety of human mitochondrial diseases. Reports have associated an A4317G mutation in the mitochondrial tRNAIle gene with fatal infantile cardiomyopathy and an A10044G mutation in the mitochondrial tRNAGly gene with sudden infant death syndrome. Here we demonstrate that both mutations inhibit in vitro CCA-addition to the respective tRNA by the human mitochondrial CCA-adding enzyme. Structures of these two mutant tRNAs were examined by nuclease probing. In the case of the A4317G tRNAIle mutant, structural rearrangement of the T-arm region, conferring an aberrantly stable T-arm structure and an increased Tm value, was clearly observed. In the case of the A10044G tRNAGly mutant, high nuclease sensitivity in both the T- and D-loops suggested a weakened interaction between the loops. These are the first reported instances of inefficient CCA-addition being one of the apparent molecular pathogeneses caused by pathogenic point mutations in human mitochondrial tRNA genes.

Original languageEnglish
Pages (from-to)16828-16833
Number of pages6
JournalJournal of Biological Chemistry
Volume278
Issue number19
DOIs
Publication statusPublished - 2003 May 9

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ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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