title: Cleavage of methylated CCCGGG sequences containing either N4-methylcytosine or 5-methylcytosine with MspI, HpaII, SmaI, XmaI and Cfr9I restriction endonucleases.
abstract: The cleavage specificity of R.Cfr9I was determined to be C decreases CCGGG whereas the methylation specificity of M.Cfr9I was C4mCCGGG. The action of MspI, HpaII, SmaI, XmaI and Cfr9I restriction endonucleases on an unmethylated parent d(GGACCCGGGTCC) dodecanucleotide duplex and a set of oligonucleotide duplexes, containing all possible substitutions of either 4mC or 5mC for C in the CCCGGG sequence, was investigated. It was found that 4mC methylation, in contrast to 5mC, renders the CCCGGG site resistant to practically all the investigated endonucleases. The cleavage of methylated substrates with restriction endonucleases is discussed.
authors.affiliation: ESP Fermentas, All Union Research Institute of Applied Enzymology, Lithuanian SSR.
authors.forename: V
authors.initials: V
authors.lastname: Butkus
authors.forename: L
authors.initials: L
authors.lastname: Petrauskiene
authors.forename: Z
authors.initials: Z
authors.lastname: Maneliene
authors.forename: S
authors.initials: S
authors.lastname: Klimasauskas
authors.forename: V
authors.initials: V
authors.lastname: Laucys
authors.forename: A
authors.initials: A
authors.lastname: Janulaitis
mesh_terms: D044503:5-Methylcytosine; D001483:Base Sequence; D003596:Cytosine / Q000031:analogs & derivatives* / Q000032:analysis; D004262:DNA Restriction Enzymes / Q000378:metabolism*; D009710:Nucleotide Mapping; D009838:Oligodeoxyribonucleotides; D013379:Substrate Specificity
chemical_list: D009838:Oligodeoxyribonucleotides; C039052:N(4)-methylcytosine; D044503:5-Methylcytosine; D003596:Cytosine; D004262:DNA Restriction Enzymes