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HypE-specific Nanobodies as Tools to Modulate HypE-mediated Target AMPylation

机译:HypE特定的纳米抗体作为调节HypE介导的目标AMPylation的工具

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摘要

The covalent addition of mono-AMP to target proteins (AMPylation) by Fic domain-containing proteins is a poorly understood, yet highly conserved post-translational modification. Here, we describe the generation, evaluation, and application of four HypE-specific nanobodies: three that inhibit HypE-mediated target AMPylation in vitro and one that acts as an activator. All heavy chain-only antibody variable domains bind HypE when expressed as GFP fusions in intact cells. We observed localization of HypE at the nuclear envelope and further identified histones H2–H4, but not H1, as novel in vitro targets of the human Fic protein. Its role in histone modification provides a possible link between AMPylation and regulation of gene expression.
机译:含Fic结构域的蛋白将单AMP共价添加到目标蛋白(AMPylation)的了解很少,但翻译后修饰却非常保守。在这里,我们描述了四种HypE特异性纳米抗体的产生,评估和应用:三种在体外抑制HypE介导的靶AMPylation,一种充当激活剂。当在完整细胞中表达为GFP融合体时,所有仅重链的抗体可变域都结合HypE。我们观察到HypE在核被膜上的定位,并进一步确定了组蛋白H2-H4,而不是H1,将其作为人类Fic蛋白的新型体外靶标。它在组蛋白修饰中的作用提供了AMPylation和基因表达调控之间的可能联系。

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