title: Endonuclease activities in extracts of Micrococcus luteus that act on gemma-irradiated DNA.
abstract: Several protein fractions containing endonuclease activity against gemma-irradiated DNA (gamma-endonuclease) were isolated from M. luteus. The crude extract was eluted on a phosphocellulose column and chromatographed on TEAE cellulose and subsequently on hydroxyapatite. Five peaks of gamma-endonuclease were obtained from each preparation. Repeated experiments showed comparable chromatographic behavior of the fractions. There was no detectable activity of U.V.-endonuclease in the fractions with gamma-endonuclease but a small contamination of endonuclease against unirradiated DNA and against DNA with apurinic sites. The gamma-endonuclease is stimulated by, but is not dependent on, magnesium. Several tests for endonuclease activity have been used: the analysis of strand breaks in calf-thymus DNA or in PM2 DNA, and the determination of end-groups formed by endonuclease, either 3'OH end-groups or phosphomonoester end groups. From the results obtained it can be assumed that the strand breaks induced by the gamma-endonuclease carry 3'OH and 5' phosphate end groups.
mesh_terms: D003037:Cobalt Radioisotopes; D004247:DNA / Q000528:radiation effects*; D004720:Endonucleases / Q000302:isolation & purification; D005720:Gamma Rays; D008836:Micrococcal Nuclease / Q000302:isolation & purification
chemical_list: D003037:Cobalt Radioisotopes; D004247:DNA; D004720:Endonucleases; D008836:Micrococcal Nuclease