Regulation of intracellular localization of human MTH1, OGG1, and MYH proteins for repair of oxidative DNA damage

Yusaku Nakabeppu

研究成果: 書籍/レポート タイプへの寄稿会議への寄与

137 被引用数 (Scopus)


In mammalian cells, more than one genome has to be maintained throughout the entire life of the cell, one in the nucleus and the other in mitochondria. It seems likely that the genomes in mitochondria are highly exposed to reactive oxygen species (ROS) as a result of their respiratory function. Human MTH1 (hMTHI) protein hydrolyzes oxidized purine nucleoside triphosphates, such as 8-oxo-dGTP, 8-oxo-dATP, and 2-hydroxy (OH)-dATP, thus suggesting that these oxidized nucleotides are deleterious for cells. Here, we report that a single-nucleotide polymorphism (SNP) in the human MTH1 gene alters splicing patterns of hMTH1 transcripts, and that a novel hMTH1 polypeptide with an additional mitochondrial targeting signal is produced from the altered hMTH1 mRNAs; thus, intracellular location of hMTH1 is likely to be affected by a SNP. These observations strongly suggest that errors caused by oxidized nucleotides in mitochondria have to be avoided in order to maintain the mitochondrial genome, as well as the nuclear genome, in human cells. Based on these observations, we further characterized expression and intracellular localization of 8-oxoG DNA glycosylase (hOGG1) and 2-OH-A/adenine DNA glycosylase (hMYH) in human cells. These two enzymes initiate base excision repair reactions for oxidized bases in DNA generated by direct oxidation of DNA or by incorporation of oxidized nucleotides. We describe the detection of the authentic hOGG1 and hMYH proteins in mitochondria, as well as nuclei in human cells, and how their intracellular localization is regulated by alternative splicing of each transcript.

ホスト出版物のタイトルProgress in Nucleic Acid Research and Molecular Biology
ホスト出版物のサブタイトルBase Excsion Repair
編集者Kive Moldave
Place of PublicationSan Dieg, CA, USA
出版社Academic Press Inc.
ISBN(印刷版)0125400683, 9780125400688
出版ステータス出版済み - 2001

!!!All Science Journal Classification (ASJC) codes

  • 分子生物学


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