Distinct substrate preference of human and mouse N-methylpurine-DNA glycosylases

N-Methylpurine-DNA glycosylase (MPG), a ubiquitous DNA repair protein, removes several N-alkylpurine adducts, hypoxanthine, cyclic ethenoadducts of adenine, guanine and cytosine and 8-oxoguanine from DNA, The recombinant human and mouse MPGs, purified from Escherichia coli, show a significant difference in substrate preference. While both proteins prefer 3-methyladenine over other N-alkylpurines in DNA, the mouse MPG removes 7-methylguanine and 3-methylguanine at an similar to 2- to 3-fold higher rate than the human protein when adjusted for equal activity for the release of 3-methyladenine from DNA, Hybrid recombinant proteins containing N-terminal and C-terminal halves of the human and mouse glycosylases were partially purified from MPG-negative E. coli. Their substrate preferences suggest that the N-terminal half is more critical for the recognition of 3-methylguanine and 7-methylguanine.