Lucanthone and Its Derivative Hycanthone Inhibit Apurinic Endonuclease-1 (APE1) by Direct Protein Binding
Figure 4
Lucanthone promotes APE1 cleavage in vitro by possible non-competitive binding.
A. Recombinant APE1 protein (250 ng) treated with 10–50 µM lucanthone at 37°C for 2 h, the numbers in italic font represent fold change in APE1 and its 25 kDa fragment as measured by area analysis using Image J quantification program. B. Lineweaver-Burke plot for endonuclease assay determinations as detailed in Materials and Methods. Units of 1/v were min/fmoles of abasic sites incised and for 1/[S] was inverse of nM of depurinated plasmid DNA.