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  • Title: Specificity of the S1 nuclease from Aspergillus oryzae.
    Author: Wiegand RC, Godson GN, Radding CM.
    Journal: J Biol Chem; 1975 Nov 25; 250(22):8848-55. PubMed ID: 171268.
    Abstract:
    Conditions are described for digesting single-stranded DNA by S1 nuclease without introducing breaks in double-stranded DNA. The enzyme is inhibited by low concentrations of various compounds of phosphate. Under certain conditions S1 nuclease cleaves the strand opposite a nick in bacteriophage T5 DNA; under other conditions, the enzyme cleaves a loop in one strand of heteroduplex lambdaDNA while leaving the opposite strand intact. S1 nuclease makes many single strand breaks in ultraviolet-irradiated duplex lambdaDNA. Superhelical DNA of phiX174 (Form I) is converted first to a relaxed circular molecule (Form II), and then to a linear molecule (Form III) by cleavage at one site per molecule. Since the cleavage occurs at many sites in the population of molecules, the partially single-stranded regions in phiX174 superhelical DNA are not determined by specific nucleotide sequences.
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