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Expression and characterisation of aPlasmodium falciparumprotein containing domains homologous to sarcalumenin and a tyrosine kinase substrate, eps151 The nucleotide sequence has been submitted to the GenBank ™ with the accession number: U84395.1

Authors
Journal
International Journal for Parasitology
0020-7519
Publisher
Elsevier
Publication Date
Volume
29
Issue
5
Identifiers
DOI: 10.1016/s0020-7519(99)00024-7
Keywords
  • Sarcoplasmic Reticulum
  • Sarcalumenin
  • Tyrosine Kinase Substrate
  • Plasmodium Falciparum
Disciplines
  • Biology

Abstract

Abstract We have identified in Plasmodium falciparum a novel gene encoding a putative bi-functional protein, termed PfPast-1, from genomic and cDNA libraries. Analysis indicated that the sequence encodes a 62 kDa protein of 529 amino acid residues with two distinctive domains: a sarcalumenin-like domain of approximately 320 amino acids at the amino half of the molecule, which shares homology to a major sarcoplasmic reticulum lumenal protein, sarcalumenin, and an eps15 homology domain of about 90 amino acids located at the carboxyl terminus. The eps15 homology domain, first identified in a tyrosine kinase substrate, eps15, and found in increasing numbers of mammalian proteins, has recently been suggested as a protein–protein interaction domain involved in intracellular sorting. Genomic sequences encoding similar proteins containing both the sarcalumenin-like and eps15 homology domains have been identified in humans and Drosophila. RNA blot analysis revealed the presence of a single messenger RNA transcript approximately 3.7 kb in size, which is expressed in all the developmental stages examined with the highest level in extracellular gametes followed by erythrocytic asexual stages, and the lowest in the gametocytes. In the attempt to define its biological function, we have expressed a full-length recombinant PfPast-1 protein in Escherichia coli. Specific immune serum directed against the recombinant protein recognised a ∼55 kDa protein in the parasite lysate. Further characterisation of PfPast-1 may help in elucidation of its functions in P. falciparum.

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