Detection of retromer assembly in Plasmodium falciparum by immunosensing coupled to Surface Plasmon Resonance

Area of Science:

• Cell Biology
• Parasitology
• Biochemistry

Background:

• The retromer complex is vital for intracellular protein trafficking in eukaryotes.
• Its partial conservation in Plasmodium falciparum presents a potential target for antimalarial therapies.
• Studying retromer assembly in Plasmodium falciparum is challenging due to the parasite's complex physiology and intra-erythrocytic location.

Purpose of the Study:

• To investigate the assembly of the retromer complex in Plasmodium falciparum.
• To develop a novel bio-sensing method for analyzing protein complex assembly in malaria parasites.
• To identify potential new targets for antimalarial drug development by understanding parasite-specific protein trafficking.

Main Methods:

• Utilized Surface Plasmon Resonance (SPR) coupled with immunosensing for high-sensitivity detection.
• Identified interacting proteins through bioinformatics and literature review.
• Developed specific antibodies against retromer components for detection.
• Prepared sensor chips by immobilizing antibodies to capture interacting proteins from whole cell lysates.
• Validated the assay using a mammalian CD74-MIF system.

Main Results:

• Successfully detected three distinct components of the retromer complex in Plasmodium falciparum.
• Demonstrated the ability to trap and detect interacting proteins within the complex using immobilized antibodies.
• Validated the bio-sensing approach in a mammalian cell system, confirming its reliability.

Conclusions:

• The study illustrates the assembly of the retromer complex in Plasmodium falciparum using a sensitive bio-sensing approach.
• This method requires minimal sample from the native source, overcoming previous limitations.
• The findings provide a foundation for developing novel antimalarials targeting parasite-specific protein trafficking pathways.