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Plasmodium falciparum normocyte binding protein (PfNBP-1) peptides bind specifically to human erythrocytes
John Jairo Valbuena1, Ricardo Vera, Javier García
1Fundación Instituto de Inmunología de Colombia, Universidad Nacional de Colombia, Cra 50 26-00, Bogotá, Colombia. john_valbuena@fidic.org.co
Insights
Plasmodium falciparum normocyte binding protein-1 (PfNBP-1) binds to human red blood cells. Specific peptides of PfNBP-1 block malaria parasite invasion, offering potential therapeutic targets.
Area of Science:
- Malariology
- Molecular Parasitology
- Structural Biology
Background:
- Plasmodium falciparum normocyte binding protein-1 (PfNBP-1) is a Plasmodium vivax RBP-1 orthologue.
- PfNBP-1 is localized to the apical merozoite region.
- PfNBP-1 mediates direct binding to the human erythrocyte membrane.
Purpose of the Study:
- To identify specific regions of PfNBP-1 responsible for erythrocyte binding.
- To characterize the binding affinity and kinetics of identified PfNBP-1 peptides.
- To assess the inhibitory potential of PfNBP-1 peptides on malaria parasite invasion.
Main Methods:
- Erythrocyte binding assays using synthetic peptides derived from PfNBP-1.
- Determination of binding affinity and saturation kinetics.
- Competition assays with glycine-scan analogue peptides to identify critical binding residues.
Main Results:
- Two high-affinity erythrocyte binding peptides (26332 and 26336) were identified within PfNBP-1.
- These peptides exhibited saturable binding with nanomolar affinity constants.
- Critical binding residues were pinpointed, and these peptides successfully blocked in vitro merozoite invasion of erythrocytes.
Conclusions:
- Specific peptide sequences within PfNBP-1 are crucial for erythrocyte binding.
- These identified peptides demonstrate potential as inhibitors of Plasmodium falciparum invasion.
- PfNBP-1 and its binding domains represent promising targets for antimalarial drug development.
Abstract:
Plasmodium falciparum normocyte binding protein-1 (PfNBP-1), a Plasmodium vivax RBP-1 orthologue is expressed in the apical merozoite area. PfNBP-1 binds directly to human erythrocyte membrane in a sialic acid-dependent but trypsin-resistant way. Erythrocyte binding assays were done with synthetic peptides covering the sequence reported as PfNBP-1. Two specific erythrocyte high activity binding peptides were found: 101VFINDLDTYQYEYFYEWNQ(120), peptide 26332, and 181NTKETYLKELNKKKMLQNKK(200), peptide 26336. These two peptides' binding was saturable and presenting nanomolar affinity constants. The critical binding residues (those residues underlined and highlighted in bold) were determined by competition assays with glycine-scan analogue peptides. These peptides were able to block merozoite in vitro invasion of erythrocytes.
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