Purification, Properties and Recognition Sequence and Cleavage Site Determinations of Restriction Endonuclease from Acetobacter pasteurianus IFO 13753 (ApaLI)(Microbiology & Fermentation Industry)

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A new restriction endonuclease, designated as ApaLI, was purified from cell-free extracts of Acetobacter pasteurianus IFO 13753 by streptomycin treatment, ammonium sulfate fractionation, combined column chromatographies on heparin-Sepharose CL-6B and DEAE-Sepharose CL-6B and Fast Protein Liquid Chromatography on Mono Q HR 5/5. The purified enzyme was homogeneous on polyacrylamide gel disc electrophoresis. The molecular weight of the purified enzyme was calculated as 26,000 daltons by gel filtration using Sephadex G-200, and the isoelectric point of the purified enzyme was 4.8 by ampholine sucrose-density gradient isoelectric focusing. The purified enzyme cleaved λ, Ad2, SV40, M13mp18 RF I, φX174 RF I and pBR322 DNAs at 4, 7, 0, 0, 1 and 3 sites, respectively. The purified enzyme worked best at 37℃ and pH 8.0 in a reaction mixture (50μl) containing 1.0μg λDNA, 10 mM Tris-HCl, 7mM 2-mercaptoethanol, 7mM MgCl_2 and 25mM NaCl. However, the purified enzyme did not require NaCl necessarily for the enzyme reaction. The purified enzyme recognized the palindromic hexanucleotide DNA sequence, 5'-GTGCAC-3' and cut between G and T, producing a 5'-cohesive tetranucleotide extension.
社団法人日本農芸化学会の論文
1990-07-23