A type II restriction endonuclease with an eight nucleotide specificity fromStreptomyces fimbriatus

Abstract
A new site-specific endonuclease, Sfi I, has been isolated from Streptomyces fimbriatus. This is the first report of a type II restriction endonuclease whose recognition specificity requires eight nucleotides. Sfi I cleaves the sequence, GGCCNNNN/NGGCC, symmetrically to produce a three base, 3′ extension.