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Molecular Characterization and Immuno-Reactivity Patterns of a Novel Plasmodium falciparum Armadillo-Type Repeat
Emmanuel Amlabu1,2, Philip Ilani1, Grace Opoku1
1West African Center for Cell Biology of Infectious Pathogens, University of Ghana, Accra, Ghana.
Abstract:
Nearly half of the genes in the Plasmodium falciparum genome have not yet been functionally investigated. We used homology-based structural modeling to identify multiple copies of Armadillo repeats within one uncharacterized gene expressed during the intraerythrocytic stages, PF3D7_0410600, subsequently referred to as P. falciparum Armadillo-Type Repeat Protein (PfATRP). Soluble recombinant PfATRP was expressed in a bacterial expression system, purified to apparent homogeneity and the identity of the recombinant PfATRP was confirmed by mass spectrometry. Affinity-purified α-PfATRP rabbit antibodies specifically recognized the recombinant protein. Immunofluorescence assays revealed that α-PfATRP rabbit antibodies reacted with P. falciparum schizonts. Anti-PfATRP antibody exhibited peripheral staining patterns around the merozoites. Given the localization of PfATRP in merozoites, we tested for an egress phenotype during schizont arrest assays and demonstrated that native PfATRP is inaccessible on the surface of merozoites in intact schizonts. Dual immunofluorescence assays with markers for the inner membrane complex (IMC) and microtubules suggest partial colocalization in both asexual and sexual stage parasites. Using the soluble recombinant PfATRP in a screen of plasma samples revealed that malaria-infected children have naturally acquired PfATRP-specific antibodies.
Insights
Researchers identified a new protein, Plasmodium falciparum Armadillo-Type Repeat Protein (PfATRP), in malaria parasites. PfATRP is present in merozoites and elicits a natural antibody response in infected children.
Area of Science:
- Malariology
- Molecular Parasitology
- Structural Biology
Background:
- Many Plasmodium falciparum genes lack functional characterization.
- Understanding novel parasite proteins is crucial for malaria control.
Purpose of the Study:
- To functionally characterize the uncharacterized gene PF3D7_0410600.
- To investigate the role of the Plasmodium falciparum Armadillo-Type Repeat Protein (PfATRP) in parasite biology.
Main Methods:
- Homology-based structural modeling to identify Armadillo repeats.
- Bacterial expression and purification of recombinant PfATRP.
- Mass spectrometry and antibody generation for protein validation.
- Immunofluorescence assays to determine protein localization.
- Schizont arrest assays to assess egress phenotype.
- Dual immunofluorescence to analyze co-localization with cellular markers.
- Screening of plasma samples for naturally acquired antibodies.
Main Results:
- Identified and characterized a novel protein, PfATRP, containing Armadillo repeats.
- Confirmed PfATRP expression in intraerythrocytic stages, with localization in merozoites.
- PfATRP is not accessible on the surface of intact merozoites.
- PfATRP partially co-localizes with the inner membrane complex and microtubules.
- Malaria-infected children possess naturally acquired antibodies against PfATRP.
Conclusions:
- PfATRP is a novel Plasmodium falciparum protein with potential roles in parasite development.
- The presence of PfATRP-specific antibodies in infected individuals suggests its potential as a biomarker or vaccine target.
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