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J. Exp. Med.,
Volume 187, Number 1, January 5, 1998 15-23
By

From the * Microbiology and Tumor Biology Center, Karolinska Institutet, the Swedish Institute for
Infectious Disease Control, S-171 77 Stockholm, Sweden; and Severe Plasmodium falciparum malaria is characterized by excessive sequestration of infected and
uninfected erythrocytes in the microvasculature of the affected organ. Rosetting, the adhesion of P. falciparum-infected erythrocytes to uninfected erythrocytes is a virulent parasite phenotype
associated with the occurrence of severe malaria. Here we report on the identification by single-cell reverse transcriptase PCR and cDNA cloning of the adhesive ligand P. falciparum
erythrocyte membrane protein 1 (PfEMP1). Rosetting PfEMP1 contains clusters of glycosaminoglycan-binding motifs. A recombinant fusion protein (Duffy binding-like 1-glutathione S
transferase; Duffy binding-like-1-GST) was found to adhere directly to normal erythrocytes,
disrupt naturally formed rosettes, block rosette reformation, and bind to a heparin-Sepharose
matrix. The adhesive interactions could be inhibited with heparan sulfate or enzymes that remove heparan sulfate from the cell surface whereas other enzymes or similar glycosaminoglycans of a like negative charge did not affect the binding. PfEMP1 is suggested to be the rosetting ligand and heparan sulfate, or a heparan sulfate-like molecule, the receptor both for
PfEMP1 binding and naturally formed erythrocyte rosettes.
Astra Research Centre, Bangalore,
560003, India
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