NUDT18 (MTH3) catalyzes the reaction of 8-oxo-GDP and water to form 8-oxo-GMP and Pi (orthophosphate) (Takagi et al. 2012). The subcellular location of NUDT18 has not been established but is assumed to be cytosolic like NUDT1.
Takagi, Y, Ito, R, Sekiguchi, M, Yamagata, Y, Setoyama, D, Kamiya, H
8-oxo-GDP phosphatase activity of NUDT18-1 [cytosol]
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