Interactions of the natural product kendomycin and the 20S proteasome.
Beck, P., Heinemeyer, W., Spath, A.L., Elnakady, Y., Muller, R., Groll, M.(2014) J Mol Biol 426: 3108-3117
- PubMed: 25038530 
- DOI: https://doi.org/10.1016/j.jmb.2014.06.019
- Primary Citation of Related Structures:  
4Q1S - PubMed Abstract: 
Natural products are a valuable source for novel lead structures in drug discovery, but for the majority of isolated bioactive compounds, the cellular targets are unknown. The structurally unique ansa-polyketide kendomycin (KM) was reported to exert its potent cytotoxic effects via impairment of the ubiquitin proteasome system, but the exact mode of action remained unclear. Here, we present a systematic biochemical characterization of KM-proteasome interactions in vitro and in vivo, including complex structures of wild type and mutant yeast 20S proteasome with KM. Our results provide evidence for a polypharmacological mode of action for KM's cytotoxic effect on cancer cells.
Organizational Affiliation: 
Center for Integrated Protein Science, Department Chemie, Lehrstuhl für Biochemie, Technische Universität München, Garching D-85747, Germany.