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Structure-Activity Relationship Studies of Antimalarial Proteasome Inhibitors─Part II. | LitMetric
With increasing reports of resistance to artemisinins and artemisinin-combination therapies, targeting the proteasome is a promising strategy for antimalarial development. We recently reported a highly selective proteasome inhibitor with anti-malarial activity in the humanized mouse model. To balance the permeability of the series of macrocycles with other drug-like properties, we conducted further structure-activity relationship studies on a biphenyl ether-tethered macrocyclic scaffold. Extensive SAR studies around the P1, P3, and P5 groups and peptide backbone identified compound TDI-8414. TDI-8414 showed nanomolar antiparasitic activity, no toxicity to HepG2 cells, high selectivity against the proteasome over the human constitutive proteasome and immunoproteasome, improved solubility and PAMPA permeability, and enhanced metabolic stability in microsomes and plasma of both humans and mice.
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