A Defense Process Found in Many Bacteria and Archaea That Protects the Organism From Invading Foreign DNA by Cleaving It with a Restriction Endonuclease. the Organism's Own DNA Is Protected by Methylation of a Specific Nucleotide Which Occurs Immediately Following Replication in the Same Target Site As the Restriction Enzyme.
Catalysis of the Transfer of a Group E.g. a Methyl Group Glycosyl Group Acyl Group Phosphorus Containing or Other Groups From One Compound (generally Regarded As the Donor) to Another Compound (generally Regarded As the Acceptor). Transferase Is the Systematic Name For Any Enzyme of EC Class 2.