Method for cloning and expression of BsrGI restriction endonuclease and BsrGI methyltransferase in E. coli

1. Isolated DNA encoding the BsrGI restriction endonuclease, wherein the isolated DNA is obtainable from Bacillus stearothermophilus GR75.

2. A recombinant DNA vector comprising a vector into which a DNA segment encoding the BsrGI restriction endonuclease has been inserted.

3. Isolated DNA encoding the BsrGI restriction endonuclease and BsrGI methylase, wherein the isolated DNA is obtainable from ATCC No. PTA-4892.

4. A vector which comprise the isolated DNA of claim 3 .

5. A host cell transformed by the vector of claims 2 or 4 .

6. A method of producing recombinant BsrGI restriction endonuclease comprising culturing a host cell transformed with the vector of claims 2 or 4 under conditions suitable for expression of said endonuclease and methylase.