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The structure of malaria pigment β-haematin

Author

Listed:
  • Silvina Pagola

    (Department of Physics & Astronomy State University of New York)

  • Peter W. Stephens

    (Department of Physics & Astronomy State University of New York)

  • D. Scott Bohle

    (University of Wyoming)

  • Andrew D. Kosar

    (University of Wyoming)

  • Sara K. Madsen

    (University of Wyoming
    University of Michigan)

Abstract

Despite the worldwide public health impact of malaria, neither the mechanism by which the Plasmodium parasite detoxifies and sequesters haem, nor the action of current antimalarial drugs is well understood. The haem groups released from the digestion of the haemoglobin of infected red blood cells are aggregated into an insoluble material called haemozoin or malaria pigment. Synthetic β-haematin (FeIII-protoporphyrin-IX)2 is chemically1,2, spectroscopically2,3 and crystallographically4 identical to haemozoin and is believed to consist of strands of FeIII-porphyrin units, linked into a polymer by propionate oxygen-iron bonds. Here we report the crystal structure of β-haematin determined using simulated annealing techniques to analyse powder diffraction data obtained with synchrotron radiation. The molecules are linked into dimers through reciprocal iron–carboxylate bonds to one of the propionic side chains of each porphyrin, and the dimers form chains linked by hydrogen bonds in the crystal. This result has implications for understanding the action of current antimalarial drugs and possibly for the design of new therapeutic agents.

Suggested Citation

  • Silvina Pagola & Peter W. Stephens & D. Scott Bohle & Andrew D. Kosar & Sara K. Madsen, 2000. "The structure of malaria pigment β-haematin," Nature, Nature, vol. 404(6775), pages 307-310, March.
    • Handle: RePEc:nat:nature:v:404:y:2000:i:6775:d:10.1038_35005132
    DOI: 10.1038/35005132
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