Abstract
Two site-specific DNA methyltransferases, M.BcoKIA and M.BcoKIB, were isolated from the thermophilic strain Bacillus coagulans K. Each of the methylases protects the recognition site 5'-CTCTTC-3'/5'-GAAGAG-3' from cleavage with the cognate restriction endonuclease BcoKI. It is shown that M.BcoKIB is an N6-adenine specific methylase and M.BcoKIA is an N4-cytosine specific methylase. According to bisulfite mapping, M.BcoKIA methylates the first cytosine in the sequence 5'-CTCTTC-3'.
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