Heme detoxification protein (HDP) and related parasite proteins involved in heme processing (HDP (for Heme detoxification protein); otherwise, no standard abbreviation for broader group)

Heme detoxification protein and related parasite enzymes are central to the malaria parasite's survival within red blood cells. During infection, Plasmodium spp. consume large quantities of host hemoglobin, releasing toxic free heme. To avoid heme-mediated toxicity, the parasite utilizes a dedicated pathway that crystallizes heme into insoluble hemozoin within the food vacuole—a process mediated predominantly by heme detoxification protein (HDP) and possibly assisted by other parasite proteins such as histidine-rich proteins. The pathway is distinct from mammalian heme handling and is widely considered the "Achilles' heel" of the parasite, forming the basis for the mechanism of action of many frontline antimalarial drugs, which inhibit hemozoin formation and lead to parasite death by accumulation of cytotoxic heme[1][2][3][4][5][6]. Targeting this pathway remains a principal approach in antimalarial drug development due to its parasite specificity and essential role in parasite survival. For structured information, the canonical target for drug discovery should specifically be "Heme detoxification protein (HDP)," "Hemozoin," or "Histidine-rich proteins" rather than the ambiguous group "heme and other parasite proteins."

Other names

Heme detoxification protein (HDP)Plasmodium falciparum HDPHemozoin (Hz) (product, sometimes used as proxy for the pathway)Histidine-rich proteins (HRP, especially HRP2/HRP3)Other less specific: "parasite heme pathway proteins"

Inhibition of hemozoin formation (blocks heme crystallization, causing accumulation of cytotoxic free heme)\nFormation of drug–heme complexes or drug–heme adducts (e.g., alkylation by artemisinin), preventing normal detoxification and causing parasite death\nSome drugs directly bind heme and prevent its sequestration