title: Enhancement of S1 nuclease-susceptibility of negatively superhelical DNA by netropsin.
abstract: It was evidenced that the antibiotic netropsin enhances the single-strand-specific nuclease S1-susceptibility of negatively superhelical DNA. In contrast, an intercalating drug inhibited S1 action on the superhelical DNA. Negatively superhelical DNA is known to possess several (or a number of) unbasepaired sites sensitive to S1 cleavage. S1 cleaves generally the DNA once at these sites to result in production of the full-length linear form. However netropsin-bound DNA had a tendency to be cleaved by S1 simultaneously at plural sites producing several species of linear DNAs smaller than full-length size.
mesh_terms: D004279:DNA, Viral / Q000378:metabolism; D004587:Electrophoresis, Agar Gel; D004720:Endonucleases / Q000378:metabolism*; D006146:Guanidines / Q000494:pharmacology*; D007700:Kinetics; D009429:Netropsin / Q000494:pharmacology*; D013539:Simian virus 40; D015719:Single-Strand Specific DNA and RNA Endonucleases; D013379:Substrate Specificity
chemical_list: D004279:DNA, Viral; D006146:Guanidines; D009429:Netropsin; D004720:Endonucleases; D015719:Single-Strand Specific DNA and RNA Endonucleases