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Cloning and expression of the gene coding for the transmission blocking target antigen Pfs48/45 of Plasmodium
C H Kocken1, J Jansen, A M Kaan
1Department of Molecular Biology, Faculty of Science, Nijmegen, The Netherlands.
Abstract:
The gene encoding the gametocyte/gamete-specific membrane protein Pfs48/45 of Plasmodium falciparum has been cloned. The Pfs48/45 gene is a non-interrupted, single copy gene that codes for a hydrophobic, non-repetitive protein of 448 amino acid residues containing a putative signal peptide at the N-terminus, a hydrophobic C-terminus and 7 potential N-glycosylation sites. Antibodies directed against a Pfs48/45-glutathione-S-transferase fusion protein reacted with both the 45-kDa and 48-kDa proteins of gametocytes. When Pfs48/45 is expressed in the baculovirus-insect cell system the recombinant Pfs48/45 protein is targeted and exposed to the insect cell surface in such a configuration that it is recognized by transmission-blocking anti-45/48-kDa monoclonal antibodies.
Insights
Researchers cloned the Plasmodium falciparum Pfs48/45 gene, crucial for malaria transmission. The resulting protein, when expressed, is recognized by antibodies that block malaria transmission.
Area of Science:
- Malariology
- Molecular Biology
- Immunology
Background:
- The Pfs48/45 protein is essential for gamete fusion in Plasmodium falciparum, the parasite responsible for severe malaria.
- Understanding Pfs48/45 is critical for developing transmission-blocking vaccines.
Purpose of the Study:
- To clone and characterize the gene encoding the Pfs48/45 protein.
- To investigate the expression and surface localization of recombinant Pfs48/45 protein.
Main Methods:
- Gene cloning and sequencing of Pfs48/45 from Plasmodium falciparum.
- Expression of recombinant Pfs48/45 protein in a baculovirus-insect cell system.
- Immunological detection using antibodies against Pfs48/45 and monoclonal antibodies.
Main Results:
- The Pfs48/45 gene is a single-copy gene encoding a 448-amino acid hydrophobic protein with a signal peptide and N-glycosylation sites.
- Antibodies against a Pfs48/45-GST fusion protein recognized native Pfs48/45 on gametocytes.
- Recombinant Pfs48/45 expressed in insect cells was targeted to the cell surface and recognized by transmission-blocking antibodies.
Conclusions:
- The Pfs48/45 gene has been successfully cloned and characterized.
- Recombinant Pfs48/45 protein can be expressed and correctly localized for recognition by transmission-blocking antibodies, supporting its potential as a vaccine candidate.