Figure 1.
Dose-dependent inhibition of pre-reduced TrxR by illudin S and AFs. TrxR (80 nM) was first incubated with NADPH (100 μM) at 25 °C for 10 min followed by the addition of test compounds and further incubated for 2 h at 25 °C (A, Illudin S, 62.5, 125, 250, 500, 1000, 2500 μM; B, AF, 2.5, 5, 12.5, 25, 50 μM; C, HMAF, 0.125, 0.25, 0.5, 1, 1.5, 2.5 μM). The residual activity was measured with DTNB assay described in the experimental details.