Parasite heme

“Parasite heme" refers to the molecule heme (iron protoporphyrin IX) as used or handled by parasitic organisms, especially malaria parasites. In Plasmodium spp., the parasite both obtains heme from host hemoglobin and synthesizes it de novo during its complex lifecycle. Within the infected red blood cell, the parasite degrades host hemoglobin, releasing toxic free heme, which it detoxifies by polymerizing into inert crystals called hemozoin. Heme is also essential as a cofactor for mitochondrial electron transport and possibly other metabolic processes. The parasite's unique mechanisms for heme acquisition, synthesis, and detoxification are distinct from those of the human host and constitute key vulnerabilities exploited by frontline antimalarial drugs such as chloroquine and artemisinin. However, 'parasite heme' per se is not a discrete protein or receptor but rather a critically important metabolite and pathway, and the most precise drug targets are individual proteins and enzymes involved in these processes.

Other names

Plasmodium hemeMalaria parasite hemeIntracellular parasite hemeHemozoin precursorParasite-synthesized hemeHost-derived heme (in context of parasite utilization)

Inhibition of heme detoxification (prevents conversion of free heme to non-toxic hemozoin, leading to parasite death); Generation of reactive oxygen species upon drug-heme interaction (artemisinin); Enzyme inhibition (targeting heme biosynthetic enzymes)