The gene of the new site-specific methyltransferase M.SscL1I belonging to the same modification-restriction system as the previously described by us site-specific endonuclease SscL1I has been cloned from the natural strain Staphylococcus sp. L1. A plasmid to express the methylase gene under control of the T7 phage-specific promotor has been constructed. Conditions were found to express the recombinant methylase M.SscL1I and to purify it to near homogeneity. It is shown that the methylase modifies the adenine base in the recognition site 5;-GANTC-3;.
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