Plasmodial heme detoxification pathway

The Plasmodial heme detoxification pathway is essential for malaria parasite survival during its intraerythrocytic stage. As the parasite digests host hemoglobin in its digestive vacuole, it releases large amounts of free heme, which is highly toxic. The parasite detoxifies heme mainly by crystallizing it into inert hemozoin. Key proteins such as Heme Detoxification Protein (HDP) and Histidine-rich protein 2 (HRP2) facilitate this process. Several first-line antimalarial drugs, including chloroquine and artemisinin derivatives, act by inhibiting or interfering with hemozoin formation, causing toxic heme to accumulate and killing the parasite.

Other names

Heme detoxification pathwayHemozoin formation pathwayPlasmodium heme detoxificationMalaria heme detoxification pathway

Inhibitors bind free heme or interfere with hemozoin crystal formation, preventing neutralization of toxic heme and leading to parasite death. Some drugs (especially chloroquine) bind the heme or its protein scaffold (such as HRP2), disrupt polymerization, and cause toxic heme accumulation. Artemisinin-based drugs alkylate heme and may inhibit heme-homozoin conversion.