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• W2093230076 abstract "From the characterization of enzyme activities and the analysis of genomic sequences, the complement of DNA methyltransferases (MTases) possessed by the cyanobacterium ANABAENA PCC 7120 has been deduced. ANABAENA has nine DNA MTases. Four are associated with Type II restriction enzymes (AVAI, AVAII, AVAIII and the newly recognized inactive AVAIV), and five are not. Of the latter, four may be classified as solitary MTases, those whose function lies outside of a restriction/modification system. The group is defined here based on biochemical and genetic characteristics. The four solitary MTases, DmtA/M.AVAVI, DmtB/M.AVAVII, DmtC/M. AVAVIII and DmtD/M.AVAIX, methylate at GATC, GGCC, CGATCG and rCCGGy, respectively. DmtB methylates cytosines at the N4 position, but its sequence is more similar to N6-adenine MTases than to cytosine-specific enzymes, indicating that it may have evolved from the former. The solitary MTases, appear to be of ancient origin within cyanobacteria, while the restriction MTases appear to have arrived by recent horizontal transfer as did five now inactive Type I restriction systems. One Mtase, M.AVAV, cannot reliably be classified as either a solitary or restriction MTase. It is structurally unusual and along with a few proteins of prokaryotic and eukaryotic origin defines a structural class of MTases distinct from all previously described." @default.
• W2093230076 created "2016-06-24" @default.
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• W2093230076 date "2001-04-01" @default.
• W2093230076 modified "2023-10-01" @default.
• W2093230076 title "DNA methyltransferases of the cyanobacterium Anabaena PCC 7120" @default.
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• W2093230076 doi "https://doi.org/10.1093/nar/29.7.1491" @default.
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