Parasitic serine protease

Parasitic serine proteases are a diverse group of enzymes characterized by a nucleophilic serine residue in their active site, playing indispensable roles in the life cycles of various protozoa and helminths [1, 3]. These enzymes facilitate critical processes such as host tissue penetration, nutrient acquisition through the degradation of host proteins, and the evasion of the host's immune system [3, 5]. In malaria-causing Plasmodium species, subtilisin-like proteases (e.g., PfSUB1) are essential for the egress of merozoites from infected erythrocytes and the subsequent invasion of new red blood cells [2, 4]. Because these proteases often have distinct substrate specificities compared to their human counterparts, they are highly attractive targets for the development of selective antiparasitic agents [1, 5]. Inhibiting these enzymes can effectively halt parasite replication and spread within the host. However, achieving high selectivity is crucial to avoid interfering with vital human serine proteases involved in blood clotting and digestion [1, 7]. Current research focuses on identifying unique structural features of parasite proteases to design potent, small-molecule inhibitors with minimal host toxicity [5].

Other names

Helminth serine proteaseProtozoan serine proteaseSubtilisin-like proteaseChymotrypsin-like proteaseParasite-derived serine peptidasePlasmodium falciparum subtilisin-like protease 1 (PfSUB1)Rhomboid protease

Inhibition of the catalytic serine residue within the active site, typically involving a Ser-His-Asp catalytic triad, which prevents the cleavage of peptide bonds in essential parasite or host proteins required for the parasite's life cycle, invasion, or egress [1, 2].