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PubMed1985

Purification of Mbo II methylase (GAAGmA) from Moraxella bovis: site specific cleavage of DNA at nine and ten base pair sequences.

The restriction modification methylase M. Mbo II has been purified using a sensitive oligonucleotide linker assay. The enzyme methylates the Mbo II recognition sequence* GAAGA at adenine to produce GAAGmA. M. Mbo II can be used in conjunction with the methylation dependent restriction endonuclease Dpn I (GmATC) to produce cleavage at the 10 base sequence GAAGATCTTC. When M. Mbo II is used in combination with M. Cla I (ATCGATCGAT), cleavage by Dpn I occurs at the four ten base sequences GAAGATCTTC, GAAGATCGAT, ATCGATCTTC and ATCGATCGAT, which is equivalent to a nine base recognition site. The use of combinations of adenine methylases and Dpn I to generate highly selective DNA cleavages at a variety of sequences up to fourteen base pairs is discussed.

Base Sequence↗