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SUMOylated SNF2PH promotes variant surface glycoprotein expression in bloodstream trypanosomes.
EMBO Reports ( IF 6.5 ) Pub Date : 2019-11-06 , DOI: 10.15252/embr.201948029
Andreu Saura 1 , Paula A Iribarren 2 , Domingo Rojas-Barros 1 , Jean M Bart 1 , Diana López-Farfán 1 , Eduardo Andrés-León 1 , Isabel Vidal-Cobo 1 , Cordula Boehm 3 , Vanina E Alvarez 2 , Mark C Field 3, 4 , Miguel Navarro 1
Affiliation  

SUMOylation is a post-translational modification that positively regulates monoallelic expression of the trypanosome variant surface glycoprotein (VSG). The presence of a highly SUMOylated focus associated with the nuclear body, where the VSG gene is transcribed, further suggests an important role of SUMOylation in regulating VSG expression. Here, we show that SNF2PH, a SUMOylated plant homeodomain (PH)-transcription factor, is upregulated in the bloodstream form of the parasite and enriched at the active VSG telomere. SUMOylation promotes the recruitment of SNF2PH to the VSG promoter, where it is required to maintain RNA polymerase I and thus to regulate VSG transcript levels. Further, ectopic overexpression of SNF2PH in insect forms, but not of a mutant lacking the PH domain, induces the expression of bloodstream stage-specific surface proteins. These data suggest that SNF2PH SUMOylation positively regulates VSG monoallelic transcription, while the PH domain is required for the expression of bloodstream-specific surface proteins. Thus, SNF2PH functions as a positive activator, linking expression of infective form surface proteins and VSG regulation, thereby acting as a major regulator of pathogenicity.

中文翻译:


SUMO 化的 SNF2PH 促进血流锥虫中变异表面糖蛋白的表达。



SUMOylation 是一种翻译后修饰,可正向调节锥虫变体表面糖蛋白 (VSG) 的单等位基因表达。与核体相关的高度 SUMO 化焦点的存在,即 VSG 基因转录的地方,进一步表明 SUMO 化在调节 VSG 表达中的重要作用。在这里,我们发现 SNF2PH(一种 SUMO 化植物同源结构域 (PH) 转录因子)在寄生虫的血流形式中上调,并在活性 VSG 端粒处富集。 SUMO 化促进 SNF2PH 募集至 VSG 启动子,这是维持 RNA 聚合酶 I 所需的,从而调节 VSG 转录水平。此外,昆虫中 SNF2PH 的异位过度表达(而非缺乏 PH 结构域的突变体)会诱导血流阶段特异性表面蛋白的表达。这些数据表明,SNF2PH SUMOylation 正向调节 VSG 单等位基因转录,而 PH 结构域是血流特异性表面蛋白表达所必需的。因此,SNF2PH 作为正激活剂发挥作用,将感染性表面蛋白的表达和 VSG 调节联系起来,从而充当致病性的主要调节因子。
更新日期:2019-12-05
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