title: Purification of Mbo II methylase (GAAGmA) from Moraxella bovis: site specific cleavage of DNA at nine and ten base pair sequences.
abstract: 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.
mesh_terms: D001483:Base Sequence; D004262:DNA Restriction Enzymes; D008745:Methylation; D008780:Methyltransferases / Q000302:isolation & purification*; D009016:Moraxella / Q000201:enzymology*; D015265:Site-Specific DNA-Methyltransferase (Adenine-Specific); D013379:Substrate Specificity
chemical_list: C047058:DNA modification methylase MboII; D008780:Methyltransferases; D015265:Site-Specific DNA-Methyltransferase (Adenine-Specific); D004262:DNA Restriction Enzymes