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A multigene family that interacts with the amino terminus of plasmodium MSP-1 identified using the yeast two-hybrid
Kerrianne Mello1, Thomas M Daly, Joanne Morrisey
1Division of Molecular Parasitology, Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, Pennsylvania, USA.
Abstract:
Merozoite surface protein 1 (MSP-1) is a high-molecular-weight protein expressed on the surface of the malaria merozoite in a noncovalent complex with other protein molecules. MSP-1 undergoes a series of proteolytic processing events, but no precise biological role for the various proteolytic fragments of MSP-1 or for the additional proteins present in the complex is known. Through the use of the yeast two-hybrid system, we have isolated genes encoding proteins that interact with a region of the amino-terminal proteolytic fragment of MSP-1 from the mouse parasite Plasmodium yoelii. This analysis has led to the isolation of two sequence-related molecules, one of which is the P. yoelii homologue of MSP-7 originally described in Plasmodium falciparum. BLAST analysis of the P. falciparum database has revealed that there are six related protein molecules present in this species encoded near each other on chromosome 13. In P. falciparum, we designated these molecules MSRP-1 to -5. Analysis of the P. yoelii database indicates a similar chromosomal organization for the two genes in the mouse parasite species. The three P. falciparum sequences with the highest degree of homology to the P. yoelii sequences isolated in the two-hybrid screen have been characterized at the molecular level (MSRP-1 to -3). Expression analysis indicated that the mRNAs are expressed at various levels in the different asexual stages. Immunofluorescence studies colocalized the expression of the MSRP molecules and the amino-terminal portion of MSP-1 to the surfaces of trophozoites. In vitro binding experiments confirmed the interaction between MSRP-1, MSRP-2, and the amino-terminal region of P. falciparum MSP-1.
Insights
Researchers identified novel proteins interacting with Plasmodium falciparum merozoite surface protein 1 (MSP-1). These findings shed light on the molecular complex of MSP-1, crucial for malaria parasite development.
Area of Science:
- Malariology
- Molecular Parasitology
- Protein Interaction Studies
Background:
- Merozoite surface protein 1 (MSP-1) is essential for malaria parasite survival.
- The precise biological function of MSP-1 and its associated proteins remains largely unknown.
- Understanding MSP-1 interactions is key to developing new antimalarial strategies.
Purpose of the Study:
- To identify proteins that interact with the amino-terminal fragment of Plasmodium yoelii MSP-1.
- To characterize homologous proteins in Plasmodium falciparum and their interaction with MSP-1.
Main Methods:
- Yeast two-hybrid system for protein interaction screening.
- BLAST analysis for sequence homology and gene identification.
- Molecular characterization, expression analysis, and immunofluorescence studies.
Main Results:
- Two sequence-related molecules interacting with P. yoelii MSP-1 were identified, including a homologue of MSP-7.
- Six related molecules (MSRP-1 to -5) were found in P. falciparum, encoded on chromosome 13.
- MSRP-1, MSRP-2, and MSRP-3 were characterized, showing expression in asexual stages.
- Immunofluorescence confirmed co-localization of MSRPs and MSP-1 N-terminus on trophozoite surfaces.
- In vitro experiments validated the binding of MSRP-1 and MSRP-2 to the P. falciparum MSP-1 N-terminus.
Conclusions:
- The study identified novel interacting partners of MSP-1, termed MSRPs.
- These MSRPs are expressed on the malaria parasite surface during asexual stages.
- The findings provide molecular insights into the MSP-1 complex and its potential role in parasite invasion.
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