Four New Type I Restriction Enzymes Identified in Escherichia Coli Clinical Isolates
Overview
Affiliations
Using a plasmid transformation method and the RM search computer program, four type I restriction enzymes with new recognition sites and two isoschizomers (EcoBI and Eco377I) were identified in a collection of clinical Escherichia coli isolates. These new enzymes were designated Eco394I, Eco826I, Eco851I and Eco912I. Their recognition sequences were determined to be GAC(5N)RTAAY, GCA(6N)CTGA, GTCA(6N)TGAY and CAC(5N)TGGC, respectively. A methylation sensitivity assay, using various synthetic oligonucleotides, was used to identify the adenines that prevent cleavage when methylated (underlined). These results suggest that type I enzymes are abundant in E.coli and many other bacteria, as has been inferred from bacterial genome sequencing projects.
Koh C, Goh Y, Toh J, Neo S, Ng S, Gunaratne J Nucleic Acids Res. 2018; 46(22):11659-11670.
PMID: 30412255 PMC: 6294517. DOI: 10.1093/nar/gky1104.
Type I restriction enzymes and their relatives.
Loenen W, Dryden D, Raleigh E, Wilson G Nucleic Acids Res. 2013; 42(1):20-44.
PMID: 24068554 PMC: 3874165. DOI: 10.1093/nar/gkt847.
Weiserova M, Ryu J BMC Microbiol. 2008; 8:106.
PMID: 18588664 PMC: 2481252. DOI: 10.1186/1471-2180-8-106.
Ryu J, Rowsell E Nucleic Acids Res. 2008; 36(13):e81.
PMID: 18562466 PMC: 2490747. DOI: 10.1093/nar/gkn056.