Evaluation of spiropiperidine hydantoins as a novel class of antimalarial agents

Marvin J. Meyers, Elizabeth J. Anderson, Sarah A. McNitt, Thomas M. Krenning, Megh Singh, Jing Xu, Wentian Zeng, Limei Qin, Wanwan Xu, Siting Zhao, Li Qin, Christopher S. Eickhoff, Jonathan Oliva, Mary A. Campbell, Stacy D. Arnett, Michael J. Prinsen, David W. Griggs, Peter G. Ruminski, Daniel E. Goldberg, Ke DingXiaorong Liu, Zhengchao Tu, Micky D. Tortorella, Francis M. Sverdrup, Xiaoping Chen

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Given the rise of parasite resistance to all currently used antimalarial drugs, the identification of novel chemotypes with unique mechanisms of action is of paramount importance. Since Plasmodium expresses a number of aspartic proteases necessary for its survival, we have mined antimalarial datasets for drug-like aspartic protease inhibitors. This effort led to the identification of spiropiperidine hydantoins, bearing similarity to known inhibitors of the human aspartic protease β-secretase (BACE), as new leads for antimalarial drug discovery. Spiropiperidine hydantoins have a dynamic structure-activity relationship profile with positions identified as being tolerant of a variety of substitution patterns as well as a key piperidine N-benzyl phenol pharmacophore. Lead compounds 4e (CWHM-123) and 12k (CWHM-505) are potent antimalarials with IC50 values against Plasmodium falciparum 3D7 of 0.310 μM and 0.099 μM, respectively, and the former features equivalent potency on the chloroquine-resistant Dd2 strain. Remarkably, these compounds do not inhibit human aspartic proteases BACE, cathepsins D and E, or Plasmodium plasmepsins II and IV despite their similarity to known BACE inhibitors. Although the current leads suffer from poor metabolic stability, they do fit into a drug-like chemical property space and provide a new class of potent antimalarial agents for further study.

Original languageEnglish
Pages (from-to)5144-5150
Number of pages7
JournalBioorganic and Medicinal Chemistry
Volume23
Issue number16
DOIs
StatePublished - Aug 11 2015

Keywords

  • Antimalarial
  • Antiplasmodial
  • Aspartic protease inhibitors
  • Spiropiperidine hydantoins

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