Design, Synthesis, and Conformation–Activity Study of Unnatural Bridged Bicyclic Depsipeptides as Highly Potent Hypoxia Inducible Factor-1 Inhibitors and Antitumor Agents
Year: 2020
Type: article
Abstract: By carrying out structural modifications based on the bicyclic peptide structure of echinomycin, we successfully synthesized various powerful antitumor derivatives. The ring conformation in the obtained compounds was restricted by cross-linking with an unnatural bond. The prepared derivatives were demonstrated to strongly suppress the hypoxia inducible factor (HIF)-1 transcriptional activation and hypoxia induction of HIF-1 protein expression. Particularly, alkene-bridged derivative 12 exhibited remarkably potent cytotoxicity (IC 50 = 0.22 nM on the MCF-7 cell line) and HIF-1 inhibition (IC 50 = 0.09 nM), which considerably exceeded those of echinomycin. Conformational analyses and molecular modeling studies revealed that the biological activities were enhanced following restriction of the conformation by cross-linking through a metabolically stable and rigid bridge bond. In addition, we proposed a new globular conformation stabilized by intramolecular π stacking that can contribute to the biological effects of bicyclic depsipeptides. The developments presented in the current study serve as a useful guide to expand the chemical space of peptides in drug discovery.
Source: Journal of Medicinal Chemistry
Language: English
Subfield: Molecular Biology
Domain: Life Sciences
Open Access status: green
Awards: Challenges to the remaining issues of therapeutically valuable pseudo-natural peptides and products, Development of tumor-selective drug based on synthetic lethal strategy by overcoming oxidative stress tolerance of cancer, G4147443295, The study of drug development targeting the stress response in the tumor microenvironment for the treatment of refractory cancer
OpenAlex ID: W3012639377