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  • Title: Specific and reversible inhibition of the blunt end joining activity of the T4 DNA ligase.
    Author: Ferretti L, Sgaramella V.
    Journal: Nucleic Acids Res; 1981 Aug 11; 9(15):3695-705. PubMed ID: 6269089.
    Abstract:
    Specific, complete and reversible inhibition of the joining of blunt ended DNA duplexes catalyzed by the T4 DNA ligase can be obtained by using ATP, the enzyme cofactor, at concentrations of 5 mM and higher. On cohesive DNA ends, 5 mM ATP, which completely inhibits blunt end ligation, brings about only a limited (8%) reduction in the level of joining obtainable under optimal ATP concentration (0,5 mM or lower). A similar but less drastic uncoupling of the two kinds of joining can be achieved at lower ATP concentration (2,5 mM) using 1 mM Mg++. The joining of DNA blunt ends can also be inhibited almost completely by 10 mM spermidine, without noticeable effect on the joining of cohesive termini.
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