Structure-function study of a Plasmodium falciparum Hsp70 using three dimensional modelling and in vitro analyses

Area of Science:

• Molecular Biology
• Parasitology
• Protein Biochemistry

Background:

• Heat shock proteins (HSPs) are vital molecular chaperones involved in protein homeostasis.
• Plasmodium falciparum, the causative agent of malaria, relies on specific HSPs for survival and virulence.
• Understanding the structure-function relationship of PfHsp70 is critical for developing novel antimalarial strategies.

Purpose of the Study:

• To elucidate the three-dimensional spatial orientation of domains within Plasmodium falciparum heat shock protein 70 (PfHsp70).
• To investigate the functional significance of the substrate binding cavity in PfHsp70's chaperone activity.
• To correlate structural features with the chaperone function of PfHsp70.

Main Methods:

• Construction and analysis of a three-dimensional model of PfHsp70 to map domain orientation.
• Purification of PfHsp70 protein for in vitro functional assays.
• Site-directed mutagenesis to introduce amino acid substitutions within the substrate binding cavity.

Main Results:

• The spatial orientation of PfHsp70 domains was successfully mapped using a 3D protein model.
• Purified PfHsp70 demonstrated significant chaperone activity in in vitro assays.
• Amino acid substitutions within the substrate binding cavity led to a marked compromise in PfHsp70's chaperone function.

Conclusions:

• The structural mapping provides insights into the functional architecture of PfHsp70.
• The substrate binding cavity is essential for the chaperone activity of PfHsp70.
• Targeting the PfHsp70 substrate binding site represents a potential therapeutic avenue against malaria.