modification methylase
modification methylase
(1) Site-specific DNA-methyltransferase (adenine-specific), EC 2.1.1.72.(2) Site-specific DNA-methyltransferase (cytosine-specific), EC 2.1.1.73.
(3) Site-specific DNA-methyltransferase (cytosine-N4-specific), EC 2.1.1.113.
Modification methylases comprise a large group of enzymes which, in conjunction with the site-specific enzymes listed as EC 3.1.21.3, EC 3.1.21.4 and EC 3.1.21.5, forms "restriction modification systems” (see there).