Journal: bioRxiv
Article Title: A clinical-stage oncology compound selectively targets drug-resistant cancers
doi: 10.1101/2025.11.26.690878
Figure Lengend Snippet: (A) Structure of the Fe 2+ complex of PAC-1, crystallized from a solution of MeOH, EtOH, and toluene. The left shows a plot of the full decameric structure and the right shows a zoomed view of the repeating and structural diagram (R = Me or Et). The ORTEP diagrams show 50% ellipsoids with hydrogens and chlorides omitted for clarity. The dashed box contains a diagram of the metal/proton binding sites. (B) UV/Vis spectra of PAC-1, PAC-1a and PAC-2 (50 µM each) in the presence of 50 µM FeCl 2 in 50 mM HEPES buffer, pH = 7.4. (C) The absorbance for solutions of PAC-1:Fe 2+ mixtures in buffered solution (50 mM HEPES, pH = 7.4). The maximum at 1:1 indicates the stoichiometry of the complex.
Article Snippet: Methanol was sparged with N 2 and dried by storage over 3 Å molecular sieves inside the glovebox for at least 72 h. Buffer A (50 mM HEPES, 100 mM KNO 3 , pH = 7.4) was prepared from HEPES buffer solution (pH 7.4, Boston BioProducts, Inc.) and KNO 3 (Sigma-Aldrich) and sparged with N 2 before use.
Techniques: Binding Assay