Heme crystallization in Plasmodium

Heme crystallization in Plasmodium refers to the unique biochemical process by which malaria parasites detoxify large quantities of free heme, a toxic byproduct released during hemoglobin digestion in infected erythrocytes. The parasite converts free heme into an insoluble crystalline form called hemozoin (also known as malaria pigment), primarily within its food vacuole. This process is essential for parasite survival during the blood stage of infection. The heme detoxification pathway, including its mechanisms (e.g., proteins such as PV5, heme detoxification protein [HDP], and various histidine-rich proteins), serves as the molecular target for several antimalarial drugs, most notably the quinoline class such as chloroquine. These drugs inhibit the formation of hemozoin, leading to toxic heme accumulation and parasite death. Ongoing studies elucidate this pathway's complexity and the potential for new therapeutic exploitation[1][2][3][4][5].

Other names

Hemozoin formationHeme biomineralizationHematin crystallizationHemozoin synthesis

Inhibition of heme crystallization (prevents conversion of toxic free heme to inert hemozoin) Drug binding to heme or hemozoin crystal surfaces, blocking crystal growth Accumulation of cytotoxic free heme within the parasite