2004
DOI: 10.1007/978-3-642-18851-0_1
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A Nomenclature for Restriction Enzymes, DNA Methyltransferases, Homing Endonucleases, and Their Genes

Abstract: A nomenclature is described for restriction endonucleases, DNA methyltransferases, homing endonucleases and related genes and gene products. It provides explicit categories for the many different Type II enzymes now identi®ed and provides a system for naming the putative genes found by sequence analysis of microbial genomes.

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Cited by 88 publications
(136 citation statements)
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“…In addition, the initiating incisions for DDAI may have been catalyzed by restriction-modification systems in place of the transposases in replicative inversion. The following considerations favor this possibility: (i) restrictionmodification genes are abundant in H. pylori genomes (19); (ii) some restriction-modification enzymes show a nicking activity (29); (iii) some restriction enzymes are similar to transposases in structure and function (30); and (iv) some restriction-modification units are similar to DNA transposons in organization (23).…”
Section: Discussionmentioning
confidence: 99%
“…In addition, the initiating incisions for DDAI may have been catalyzed by restriction-modification systems in place of the transposases in replicative inversion. The following considerations favor this possibility: (i) restrictionmodification genes are abundant in H. pylori genomes (19); (ii) some restriction-modification enzymes show a nicking activity (29); (iii) some restriction enzymes are similar to transposases in structure and function (30); and (iv) some restriction-modification units are similar to DNA transposons in organization (23).…”
Section: Discussionmentioning
confidence: 99%
“…For example, R.MboII recognizes the asymmetric sequence 5=-GAAGA-3=/3=-CTTCT-5=. M1.MboII modifies the last adenine of the top-strand recognition sequence, and M2.MboII transfers the methyl group to the internal cytosine in the bottom strand (4,78). In contrast, type III R-M systems utilize only one MTase to discriminate self from nonself (e.g., hemimethylation of the internal adenine in the sequence 5=-AGACC-3= by M.EcoP1I) (14).…”
Section: Strategies Against R-m Systemsmentioning
confidence: 99%
“…R-M systems are classified mainly into four different types based on their subunit composition, sequence recognition, cleavage position, cofactor requirements, and substrate specificity (4). Type I enzymes consist of a hetero-oligomeric protein complex encompassing both restriction and modification activities.…”
Section: Introductionmentioning
confidence: 99%
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“…The MTase modifies DNA by methylation of cytosine and adenine residues within the REase recognition sequence so that the host DNA is protected from the REase activity ( Figure 1A). RM systems are classifi ed according to the recognition site, cleavage position, subunit composition, and cofactor requirements into four groups (types I-IV) (Roberts 2003). Since the discovery of RM systems about 50 years ago, almost 5,000 restriction endonucleases, representing more than 300 modes of activity have been discovered in bacterial and archaeal genomes, 66 of which are cyanobacterial.…”
Section: Restriction-modifi Cation Systemsmentioning
confidence: 99%