title: Bacteriophage T7 defective in the gene 6 exonuclease promotes site-specific cleavages of T7 DNA in vivo and in vitro.
abstract: Site-specific cleavages of intracellular DNA were demonstrated in bacteriophage T7 6am-infected cells. The sites of the cleavages were located at 46.8 and 68.7% (1% of the T7 DNA length = 400 base pairs) from the left end of the T7 genome. These cleavages required the products of genes 3 (endonuclease), 4 (DNA primase), and 5 (DNA polymerase). However, the product of gene 6 (exonuclease) must be absent. Site-specific cleavage was also shown to occur in vitro in extracts of T7 6am-infected cells, although at a different site: 82.8% from the left end of the T7 genome.
mesh_terms: D019915:DNA Primase; D004279:DNA, Viral / Q000378:metabolism*; D004259:DNA-Directed DNA Polymerase / Q000378:metabolism; D004706:Endodeoxyribonucleases / Q000378:metabolism; D005090:Exodeoxyribonucleases / Q000235:genetics* / Q000378:metabolism; D005814:Genes, Viral; D009154:Mutation; D012316:RNA Nucleotidyltransferases / Q000378:metabolism; D013604:T-Phages / Q000201:enzymology* / Q000235:genetics
chemical_list: D004279:DNA, Viral; D019915:DNA Primase; D012316:RNA Nucleotidyltransferases; D004259:DNA-Directed DNA Polymerase; D004706:Endodeoxyribonucleases; D005090:Exodeoxyribonucleases