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首页> 外文期刊>Cellular microbiology >A touch of Zen: post-translational regulation of the Leishmania stress response
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A touch of Zen: post-translational regulation of the Leishmania stress response

机译:淡淡的禅意:利什曼原虫应激反应的翻译后调控

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摘要

Across bacterial, archaeal and eukaryotic kingdoms, heat shock proteins (HSPs) are defined as a class of highly conserved chaperone proteins that are rapidly induced in response to temperature increase through dedicated heat shock transcription factors. While this transcriptional response governs cellular adaptation of fungal, plant and animal cells to thermic shock and other forms of stress, early-branching eukaryotes of the kinetoplastid order, including trypanosomatid parasites, lack classical mechanisms of transcriptional regulation and show largely constitutive expression of HSPs, thus raising important questions on the function of HSPs in the absence of stress and the regulation of their chaperone activity in response to environmental adversity. Understanding parasite-specific mechanisms of stress-response regulation is especially relevant for protozoan parasites of the genus Leishmania that are adapted for survival inside highly toxic phagolysosomes of host macrophages causing the various immuno-pathologies of leishmaniasis. Here we review recent advances on the function and regulation of chaperone activities in these kinetoplastid pathogens and propose a new model for stress-response regulation through a reciprocal regulatory relationship between stress kinases and chaperones that may be relevant for parasite-adaptive differentiation and infectivity.
机译:在细菌,古细菌和真核生物界,热激蛋白(HSP)被定义为一类高度保守的伴侣蛋白,它们通过专门的热激转录因子响应温度升高而快速诱导。虽然这种转录反应控制着真菌,植物和动物细胞对热休克和其他形式压力的细胞适应,但动植物体顺序的早期分支真核生物(包括锥虫体寄生虫)缺乏经典的转录调控机制,并且在很大程度上表现出HSP的组成型表达,因此,在没有压力的情况下,对HSP的功能提出了重要的问题,并提出了应对环境逆境时其伴侣活性的调节方法。了解寄生虫特有的应激反应调节机制与利什曼原虫属的原生动物寄生虫特别相关,利什曼原虫适合于在宿主巨噬细胞的高毒性吞噬溶酶体中存活,从而引起利什曼病的各种免疫病理。在这里,我们审查在这些动质体病原体中的伴侣活动的功能和调节的最新进展,并提出了一种新的应激反应调节模型,该模型通过应激激酶和伴侣之间的相互调节关系进行,这可能与寄生虫适应性分化和感染性有关。

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