Abstract
EcoRI methylase is able to catalyze methy incorporation into DNA at sequences other than the canonical EcoRI site. At high enzyme concentrations and over a wide range of pH and ionic strengths, EcoRI methylase modifies polyoma DNA (which contains one EcoRI site) at a number of sites. This modification prevents EcoRI endonuclease activity, and thus is presumably at or near the EcoRI sequences (5') NAATTN.
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