β-Hematin

β-Hematin is the synthetic crystalline form of hemozoin, a biomineral produced by malaria parasites as a means to detoxify free heme released during hemoglobin digestion1[2][5]. In Plasmodium, free heme is toxic, and its aggregation into insoluble β-hematin (hemozoin) is essential for parasite survival[5]. The crystal structure consists of head-to-tail μ-propionato dimers of ferriprotoporphyrin IX, aggregated via Fe–O propionate bonds, π–π stacking, and hydrogen bonding[3][5]. Antimalarial drugs such as chloroquine, quinine, pyronaridine, mefloquine, and artemisinin act by inhibiting β-hematin formation, using distinct inhibition modes targeting specific crystal faces or sites on the growing crystal, ultimately poisoning the parasite through toxic heme accumulation[4][6]. β-Hematin itself is not a "receptor" or "enzyme" but is considered a validated antimalarial drug target due to its essential biological role. There is no known human endogenous form; it is found only in heme metabolism of certain parasites. "β-Hematin" and "Hemozoin" are used interchangeably in literature, with "β-Hematin" commonly denoting the synthetic form and "Hemozoin" the biologically produced parasitic crystal[2][5]. Its molecular class is best described as a crystalline biomineral or aggregate, not a classical protein, enzyme, or receptor.

Other names

HemozoinSynthetic hemozoinBeta-hematinFerriprotoporphyrin IX dimer

- Inhibition of β-hematin crystallization/blocking heme detoxification pathway (for most antimalarials)[4][5][6]; - Binding to heme or β-hematin to prevent or disrupt crystal formation, leading to accumulation of toxic free heme in parasite[4][6]