Abstract
Bioassay-guided fractionation of the active organic extract of Chaetomium globosum, a fungus isolated from maize, led to the separation of one epipolythiodioxopiperazine, which was identified as chaetomin (1). Compound 1 binds to the new human calmodulin (hCaM) biosensor hCaM M124C-A350, with a k d value in the nM order (kd=57 nM), eleven-fold higher than trifluoroperazine (TFP) used as positive control. Molecular docking predicted that 1 interacts with CaM in a similar site as KAR-2 (a vinblastine derivative) compound does. In conclusion, compound 1 binds to CaM with a higher affinity, which might explain its cytotoxic effect against some cancer cell lines.
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