Mouse MTH2 protein which prevents mutations caused by 8-oxoguanine nucleotides

Jian-Ping Cai¹, Toru Ishibashi, Yasumitsu Takagi

¹Department of Biology and Frontier Research Center, Fukuoka Dental College, Fukuoka 814-0193, Japan.

Biochemical and Biophysical Research Communications

|May 28, 2003

Abstract:

MutT-related proteins degrade 8-oxo-7,8-dihydrodeoxyguanosine triphosphate (8-oxo-dGTP), a mutagenic substrate for DNA synthesis, in the nucleotide pool, thereby preventing DNA replication errors. During a search of GenBank EST database, we found a new member of MutT-related protein, MTH2, which possesses the 23-amino acid MutT module. The cloned mouse MTH2 (mMTH2) cDNA was expressed in Escherichia coli mutT(-) cells and the protein was purified. mMTH2 protein hydrolyzes 8-oxo-dGTP to 8-oxo-dGMP, with Km of 32 microM. Expression of cDNA for mMTH2 reduced significantly the elevated level of spontaneous mutation frequency of E. coli mutT(-) cells. Thus, MTH2 has a potential to protect the genetic material from the untoward effects of endogenous oxygen radicals. MTH2 could act as an MTH1 redundancy factor.

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