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Immunophilin-protein interactions in Plasmodium falciparum

机译:恶性疟原虫中免疫蛋白与蛋白质的相互作用

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Immunophilins comprise two protein families, cyclophilins (CYPs) and FK506-binding proteins (FKBPs), and are the major receptors for the immunosuppressive drugs cyclosporin A (CsA) and FK506 (tacrolimus), respectively. Most eukaryotic species have at least one immunophilin and some of them have been associated with pathogenesis of infectious or parasitic diseases or the action of antiparasitic drugs. The human malarial parasite Plasmodium falciparum has 13 immunophilin or immunophilin-like genes but the functions of their products are unknown. We set out to identify the parasite proteins that interact with the major CYPs, PfCYP19A and PfCYP19B, and the FKBP, PfFKBP35, using a combination of co-immunoprecipitation and yeast two-hybrid screening. We identified a cohort of putative interacting partners and further investigation of some of these revealed potentially novel roles in parasite biology. We demonstrated that (i) P. falciparum CYPs interacted with the heat shock protein 70, (ii) treatment of parasites with CYP ligands disrupted transport of the rhoptry-associated protein 1, and (iii) PfFKBP35 interacted with parasite histones in a way that might modulate gene expression. These findings begin to elucidate the functions of immunophilins in malaria. Furthermore, the known antimalarial effects of CsA, FK506 and non-immunosuppressive derivatives of these immunophilin ligands could be mediated through these partner proteins.
机译:免疫亲和素包含两个蛋白家族:亲环蛋白(CYPs)和FK506结合蛋白(FKBPs),分别是免疫抑制剂环孢菌素A(CsA)和FK506(他克莫司)的主要受体。大多数真核物种具有至少一种亲免蛋白,其中一些与传染性或寄生虫病的发病机理或抗寄生虫药的作用有关。人类疟原虫恶性疟原虫具有13个亲免蛋白或类似亲免蛋白的基因,但其产物的功能尚不清楚。我们着手使用共免疫沉淀和酵母双杂交筛选技术,鉴定与主要CYP,PfCYP19A和PfCYP19B以及FKBP,PfFKBP35相互作用的寄生虫蛋白。我们确定了一组假定的相互作用伙伴,并对其中一些进行了进一步调查,揭示了它们在寄生虫生物学中的潜在新作用。我们证明(i)恶性疟原虫CYP与热激蛋白70相互作用,(ii)用CYP配体处理寄生虫破坏了与rhoptry相关蛋白1的运输,并且(iii)PfFKBP35与寄生虫组蛋白相互作用的方式是可能调节基因表达。这些发现开始阐明免疫亲和素在疟疾中的功能。此外,CsA,FK506和这些亲免蛋白配体的非免疫抑制衍生物的已知抗疟作用可以通过这些伴侣蛋白介导。

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