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class I SAM-dependent DNA methyltransferase
class I SAM-dependent DNA methyltransferase catalyzes the methylation of a specific DNA substrate using S-adenosyl-L-methionine (SAM or AdoMet) as the methyl donor similar to type I restriction-modification system modification (M) subunit (HsdM), which together with specificity (S) subunit (HsdS), forms a methyltransferase that methylates two adenine residues in complementary strands of a bipartite DNA recognition sequence
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