The Role of Cytoplasmic mRNA Cap-Binding Protein Complexes in Trypanosoma brucei and Other Trypanosomatids.

The Role of Cytoplasmic mRNA Cap-Binding Protein Complexes in Trypanosoma brucei and Other Trypanosomatids.
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DOI:
10.3390/pathogens6040055
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发表时间:
2017-10-27
期刊:
Pathogens (Basel, Switzerland)
影响因子:
--
通讯作者:
de Melo Neto OP
de Melo Neto OP
中科院分区:
其他
文献类型:
--
作者:
Freire ER;Sturm NR;Campbell DA;de Melo Neto OP

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锥虫原生动物是不寻常的真核生物,众所周知,它们具有不寻常的基因表达控制方式。在这些生物体中缺乏精细的转录控制模式是由几种转录后控制机制补偿的,例如mRNA周转的控制和翻译mRNA的选择,这些机制可以调节蛋白质合成以响应在不同宿主中发现的几种环境条件。在其他真核生物中,选择mRNA进行翻译是由复合物eIF 4F介导的,复合物eIF 4F是由亚基eIF 4 E、eIF 4G和eIF 4A组成的异源三聚体蛋白复合物,其中eIF 4 E结合成熟mRNA的5′-帽结构。在这篇综述中,我们提出并讨论了6个锥虫eIF 4 E同系物及其相关蛋白,形成多个eIF 4F复合物的特点。在锥虫中存在多个eIF 4F复合物引起了差异mRNA识别翻译的精致机制。
Trypanosomatid protozoa are unusual eukaryotes that are well known for having unusual ways of controlling their gene expression. The lack of a refined mode of transcriptional control in these organisms is compensated by several post-transcriptional control mechanisms, such as control of mRNA turnover and selection of mRNA for translation, that may modulate protein synthesis in response to several environmental conditions found in different hosts. In other eukaryotes, selection of mRNA for translation is mediated by the complex eIF4F, a heterotrimeric protein complex composed by the subunits eIF4E, eIF4G, and eIF4A, where the eIF4E binds to the 5′-cap structure of mature mRNAs. In this review, we present and discuss the characteristics of six trypanosomatid eIF4E homologs and their associated proteins that form multiple eIF4F complexes. The existence of multiple eIF4F complexes in trypanosomatids evokes exquisite mechanisms for differential mRNA recognition for translation.
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