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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | García, Javier E. Ocampo, Marisol Curtidor, Hernando Puentes, Alvaro Torres, Elizabeth López, Ramses López, Yolanda Valbuena, John J. Patarroyo, Manuel A. Vera, Ricardo Rodríguez, Luis E. Patarroyo, Manuel E. Tovar, Diana Cortes, Jimena Ramírez, Luis E. |
| Description | Country affiliation: Colombia Author Affiliation: Ocampo M ( Fundación Instituto de Immunologia de Colombia and Universidad Nacional de Colombia, Avda. Calle 26 No. 50-00, Bogotá, Colombia. marisol_ocampo@fidic.org.co) |
| Abstract | Adhesion of mature asexual stage Plasmodium falciparum parasite-infected erythrocytes (iRBC) to the vascular endothelium is a critical event in the pathology of Plasmodium falciparum malaria. It has been suggested that the clag gene family is essential in cytoadherence to endothelial receptors. Primers used in PCR and RT-PCR assays allowed us to determine that the gene encoding CLAG 3 (GenBank accession no. NP_473155) is transcribed in the Plasmodium falciparum FCB2 strain. Western blot showed that antisera produced against polymerized synthetic peptides from this protein recognized a 142-kDa band in P. falciparum schizont lysate. Seventy-one 20-amino-acid-long nonoverlapping peptides, spanning the CLAG 3 (cytoadherence-linked asexual protein on chromosome 3) sequence were tested in C32 cell and erythrocyte binding assays. Twelve CLAG peptides specifically bound to C32 cells (which mainly express CD36) with high affinity, hereafter referred to as high-affinity binding peptides (HABPs). Five of them also bound to erythrocytes. HABP binding to C32 cells and erythrocytes was independent of peptide charge or peptide structure. Affinity constants were between 100 nM and 800 nM. Cross-linking and SDS-PAGE analysis allowed two erythrocyte binding proteins of around 26 kDa and 59 kDa to be identified, while proteins of around 53 kDa were identified as possible receptor sites for C-32 cells. The HABPs' role in Plasmodium falciparum invasion inhibition was determined. Such an approach analyzing various CLAG 3 regions may elucidate their functions and may help in the search for new antigens important for developing antimalarial vaccines. |
| ISSN | 09618368 |
| e-ISSN | 1469896X |
| Journal | Protein Science |
| Issue Number | 2 |
| Volume Number | 14 |
| Language | English |
| Publisher | Wiley-Blackwell (on behalf of The Protein Society) |
| Publisher Date | 2005-02-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Cell Adhesion Molecules Chemistry Erythrocytes Metabolism Parasitology Plasmodium Falciparum Protozoan Proteins Physiology Amino Acid Sequence Animals Antibodies Antigens, Cd36 Blotting, Western Circular Dichroism Cross-linking Reagents Dna Primers Dna, Complementary Electrophoresis, Polyacrylamide Gel Immunoblotting Molecular Sequence Data Peptides Polymerase Chain Reaction Polymers Protein Binding Protein Conformation Protein Structure, Tertiary Reverse Transcriptase Polymerase Chain Reaction Sequence Homology, Amino Acid Research Support, Non-u.s. Gov't Discipline Biochemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Medicine Molecular Biology Biochemistry |
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