RESUMO
The spatial orientation of domains of the heat shock protein 70 from Plasmodium falciparum (PfHsp70) were mapped based on a three-dimensional model of the protein. Purified PfHsp70 displayed chaperone activity in vitro. Amino acid substitutions introduced in the chaperone's substrate binding cavity compromised the protein's chaperone function.
Assuntos
Proteínas de Choque Térmico HSP70/química , Proteínas de Choque Térmico HSP70/metabolismo , Modelos Moleculares , Plasmodium falciparum , Proteínas de Protozoários/química , Proteínas de Protozoários/metabolismo , Trifosfato de Adenosina/metabolismo , Trifosfato de Adenosina/farmacologia , Sequência de Aminoácidos , Animais , Sítios de Ligação , Relação Dose-Resposta a Droga , Proteínas de Choque Térmico HSP70/isolamento & purificação , Proteínas de Choque Térmico HSP70/farmacologia , Humanos , Interações Hidrofóbicas e Hidrofílicas , Malato Desidrogenase/metabolismo , Dados de Sequência Molecular , Ligação Proteica/efeitos dos fármacos , Conformação Proteica , Proteínas de Protozoários/isolamento & purificação , Proteínas de Protozoários/farmacologia , Relação Estrutura-Atividade , TemperaturaRESUMO
Heat shock protein 70 (Hsp70) and heat shock protein 40 (Hsp40) function as molecular chaperones during the folding and trafficking of proteins within most cell types. However, the Hsp70-Hsp40 chaperone partnerships within the malaria parasite, Plasmodium falciparum, have not been elucidated. Only one of the 43 P. falciparum Hsp40s is predicted to be a cytosolic, canonical Hsp40 (termed PfHsp40) capable of interacting with the major cytosolic P. falciparum-encoded Hsp70, PfHsp70. Consistent with this hypothesis, we found that PfHsp40 is upregulated under heat shock conditions in a similar pattern to PfHsp70. In addition, PfHsp70 and PfHsp40 reside mainly in the parasite cytosol, as assessed using indirect immunofluorescence microscopy. Recombinant PfHsp40 stimulated the ATP hydrolytic rates of both PfHsp70 and human Hsp70 similar to other canonical Hsp40s of yeast (Ydj1) and human (Hdj2) origin. In contrast, the Hsp40-stimulated plasmodial and human Hsp70 ATPase activities were differentially inhibited in the presence of pyrimidinone-based small molecule modulators. To further probe the chaperone properties of PfHsp40, protein aggregation suppression assays were conducted. PfHsp40 alone suppressed protein aggregation, and cooperated with PfHsp70 to suppress aggregation. Together, these data represent the first cellular and biochemical evidence for a PfHsp70-PfHsp40 partnership in the malaria parasite, and furthermore that the plasmodial and human Hsp70-Hsp40 chaperones possess unique attributes that are differentially modulated by small molecules.