Hemozoin (beta-hematin) (Hz)

Hemozoin, commonly referred to as malaria pigment, is a dark-brown biocrystal synthesized by Plasmodium parasites during their intraerythrocytic stage. As the parasite digests host hemoglobin to obtain essential amino acids, it releases large quantities of free heme (ferriprotoporphyrin IX), which is highly toxic to the parasite due to its ability to generate reactive oxygen species and destabilize lipid membranes (Sullivan, 2002, International Journal for Parasitology). To survive, the parasite detoxifies this heme by sequestering it into chemically inert, insoluble hemozoin crystals within its acidic digestive vacuole (Coronado et al., 2014, Toxins). This crystallization process is a vital metabolic pathway and serves as the primary therapeutic target for the quinoline class of antimalarial drugs. Drugs such as chloroquine and quinine accumulate in the digestive vacuole and bind to the growing faces of the hemozoin crystal or to free heme itself, preventing further crystallization (Egan, 2008, Journal of Inorganic Biochemistry). This interference results in a lethal buildup of toxic free heme, which ultimately destroys the parasite's internal membranes and leads to cell death (Weissbuch & Leiserowitz, 2008, Chemical Reviews).

Other names

Malaria pigmentBeta-hematinFerriprotoporphyrin IXHeme crystalFP-IX

Inhibition of heme biocrystallization (the conversion of toxic free heme into inert hemozoin), leading to the accumulation of toxic ferriprotoporphyrin IX which causes oxidative stress and membrane lysis within the parasite.