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Solution structure of Plasmodium falciparum Hsp90 indicates a high flexible dimer
Noeli S M Silva1, Marcela S Torricillas1, Karine Minari2
1São Carlos Institute of Chemistry, University of São Paulo, São Carlos, SP, Brazil.
Archives of Biochemistry and Biophysics
|July 18, 2020
Summary
This study characterizes Plasmodium falciparum Hsp90 (PfHsp90) structure and nucleotide binding. PfHsp90 is an elongated, flexible dimer crucial for malaria parasite viability.
Area of Science:
- Molecular Biology
- Structural Biology
- Parasitology
Background:
- Heat shock protein 90 (Hsp90) is a vital molecular chaperone in eukaryotes.
- Hsp90 is essential for the survival of Plasmodium falciparum, the malaria parasite.
- Inhibiting Hsp90 compromises parasite growth and differentiation.
Purpose of the Study:
- To characterize the structure of recombinant Plasmodium falciparum Hsp90 (PfHsp90) and its domains.
- To investigate the nucleotide-binding properties and conformational dynamics of PfHsp90.
- To understand the structural basis of PfHsp90 function in malaria.
Main Methods:
- Recombinant expression and purification of PfHsp90, PfHsp90MD, and PfHsp90NMD proteins.
- Biochemical assays for nucleotide binding and dissociation constant determination.
- Small-angle X-ray scattering (SAXS) for structural analysis in solution.
Main Results:
- High-purity, folded PfHsp90 and its constructs were obtained.
- PfHsp90 and PfHsp90NMD bind adenosine nucleotides via the N-terminal domain, requiring Mg2+.
- PfHsp90 exists as an elongated, flexible dimer in solution, with the C-terminal domain critical for dimerization.
Conclusions:
- PfHsp90 is a flexible, elongated dimer essential for Plasmodium falciparum viability.
- Structural characterization provides insights into Hsp90 function in malaria parasites.
- Understanding PfHsp90 structure may aid in developing new antimalarial therapies.
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