SbvI restriction endonuclease from Streptococcus bovis.

Restriction endonuclease SbvI, an isoschizomer of HaeIII, has been isolated from rumen amylolytic bacterium Streptococcus bovis II/1. SbvI was purified from cell extract by phosphocellulose chromatography and heparin-Sepharose chromatography. The recognition sequence of SbvI was identified by digestion of pBR322, pUC9 and lambda-DNA and comparing the cleavage patterns obtained with computer-derived data. SbvI recognizes the 4-bp palindrome, 5'-GGCC-3' and cleaves DNA after the second G in the sequence, producing blunt ends.