Antiplasmodial drug targets: a patent review (2000 - 2013)

New antimalarials with novel modes of action are crucial in countering the challenge of emerging drug-resistant Plasmodium falciparum. Equally significant is the identification and characterization of the targets these compounds inhibit. Biochemical evidence from seminal studies, whole genome clues and high-throughput chemical screening data provide starting points worth exploring in target identification efforts. Several proteins and biochemical processes/pathways critical to parasite survival have since been profiled and patented.

In this review, an analysis of patents describing the characterization of different enzymatic and/or biosynthetic targets in P. falciparum over the last fourteen years is presented. The review also details structures, biological evaluation, potential modes of action and therapeutic utilities of small molecule antiplasmodial compounds from ongoing research, designed to inhibit these targets.

Though various strategies to address antimalarial drug resistance exist, direct inhibition of unrelated targets and non-genome coded processes potentially present the most effective options. Additionally, interest in peptides as antimalarials merits further exploration especially in view of their unique low susceptibility to resistance, wider spectrum of action and faster activity. Finally, target-based optimization and chemical validation of novel targets can be facilitated by routine phenotypic whole-cell screening of antiplasmodial hits against any new target(s).