NUDT1 hydrolyses 8-oxo-dATP to 8-oxo-dAMP

Stable Identifier
Reaction [transition]
Homo sapiens
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NUDT1 (MTH1) catalyzes the reaction of 8-oxo-dATP and water to form 8-oxo-dAMP and PPi (pyrophosphate). Four NUDT1 proteins have been identified, encoded by a single gene with alternative start codons (Oda et al. 1999). The shortest of these, NUDT1 p18, has been shown to catalyze hydrolysis of 8-oxo-dATP (Fujikawa et al. 2001). The active enzyme is a monomer associated with a magnesium ion (Mishima et al. 2004). The longer isoforms all consist of the p18 polypeptide with aminoterminal extensions and are presumed to be active as well, but have not been experimentally characterized. The p18 isoform is predominantly cytosolic (Kang et al. 1995). Its expression prevents the accumulation of modified adenosine bases in DNA in mutant mouse cells lacking endogenous NUDT1 activity, supporting the hypothesis that by cleaving 8-oxo-dATP and thus preventing its incorporation into DNA, NUDT1 provides a physiologically important defense against mutagenesis due to oxidative stress (Yoshimura et al. 2003).
Literature References
PubMed ID Title Journal Year
15133035 Structure of human MTH1, a Nudix family hydrolase that selectively degrades oxidized purine nucleoside triphosphates

Mishima, M, Shirakawa, M, Itoh, N, Takahashi, M, Furuichi, M, Iwai, S, Nakabeppu, Y, Yamagata, Y, Sakai, Y, Kamiya, H

J. Biol. Chem. 2004
12857738 An oxidized purine nucleoside triphosphatase, MTH1, suppresses cell death caused by oxidative stress

Furuichi, M, Yoshimura, D, Iwai, S, Ohno, M, Nakabeppu, Y, Sakumi, K, Sakai, Y

J. Biol. Chem. 2003
10536140 Multi-forms of human MTH1 polypeptides produced by alternative translation initiation and single nucleotide polymorphism

Itoh, R, Nishioka, K, Oda, H, Taketomi, A, Suzuki, T, Maruyama, R, Nakabeppu, Y, Sekiguchi, M, Yakushiji, H

Nucleic Acids Res. 1999
7782328 Intracellular localization of 8-oxo-dGTPase in human cells, with special reference to the role of the enzyme in mitochondria

Iyama, A, Furuichi, M, Fujiwara, T, Nishida, J, Nakabeppu, Y, Kang, D, Sekiguchi, M, Takeshige, K

J. Biol. Chem. 1995
10373420 The oxidized forms of dATP are substrates for the human MutT homologue, the hMTH1 protein

Fujii, Y, Fujikawa, K, Nakabeppu, Y, Kasai, H, Yakushiji, H, Kamiya, H

J. Biol. Chem. 1999
Catalyst Activity

8-oxo-(d)RTP hydrolase activity of NUDT1 [cytosol]

Orthologous Events
Cross References
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