Recombinant DNA Clone Containing A Genomic Fragment of PFHRP-II Gene From Plasmodium Falciparum


A fragment of the PfHRP-II gene of Plasmodium falciparum was cloned using recombinant DNA techniques. This clone is capable of encoding PfHRP-II protein, a water-soluble, histidine-rich molecule that may be effective in the detection, diagnosis, and treatment of human malaria, which is caused by the parasite, P. falciparum. This protein may be particularly useful in the development of an anti-malaria vaccine. To date, no malaria vaccine has been successful in human trials and most exhibit only limited effectiveness in primates.
Recombinant DNA clone containing a genomic fragment of PfHRP-II gene from plasmodium falciparum The invention relates to isolated clones of DNA from Plasmodium falciparum that encode a histidine-rich protein from that organism. The PfHRPII protein is expressed in P. falciparum-infected erythrocytes. The cloned gene segment includes an intron-exon boundary near the amino-terminus of the coding sequence. The PfHRPII protein has a Mr of 60-80 kDa as determined by SDS-PAGE. This is substantially higher than the molecular weight of about 35 kDa as estimated from the predicted amino acid sequence of PfHRPII. The PfHRPII amino acid sequence includes a hydrophobic leader sequence, consistent with secretion of PfHRPII observed in vivo and in vivo. The amino acid sequence of PfHRPII is also characterized by a number of tandem repeats having a high content of histidine, alanine and aspartic acid.

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Basic research
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IP information

Granted Patent Reference Number(s): US 5,476,785
bandoned Patent Reference Number(s): US 5,296,382; US 5,130,416; US07/279,245; US06/895,942