Cloning of NruI and Sbo13I restriction and modification sstems in E. coli and amino acid sequence comparison of M.NruI and M.Sbo13I with other amino-methyltransferases
2010
Background
NruI and Sbo13I are restriction enzyme isoschizomers with the same recognition sequence 5' TCG↓CGA 3' (cleavage as indicated↓). Here we report the cloning of NruI and Sbo13I restriction-modification (R-M) systems in E. coli. The NruI restriction endonuclease gene (nruIR) was cloned by PCR and inverse PCR using primers designed from the N-terminal amino acid sequence. The NruI methylase gene (nruIM) was derived by inverse PCR walking.
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