Structural insights into the substrate binding adaptability and specificity of human O-GlcNAcase.

Structural insights into the substrate binding adaptability and specificity of human O-GlcNAcase.
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DOI:
10.1038/s41467-017-00865-1
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发表时间:
2017-09-22
影响因子:
16.6
通讯作者:
Jiang J
Jiang J
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Li B;Li H;Hu CW;Jiang J

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O-连接的β-N-乙酰葡糖胺(O-GlcNAc)修饰动态调节许多蛋白质的功能。一种单一的人酶O-连接的β-N-乙酰葡糖胺酶(O-GlcNAcase或OGA)水解这种修饰。迄今为止,OGA如何识别各种底物在很大程度上仍然是未知的。在这里,我们报告的结构OGA在复杂的四个不同的糖肽底物,含有一个单一的O-GlcNAc修饰的丝氨酸或苏氨酸残基。有趣的是,这些糖肽在OGA的底物结合裂缝内以双向但保守的构象结合。这项研究提供了一个一般原则,赋予底物结合的适应性和特异性OGA在O-GlcNAc的调节的基本见解。O-连接的β-N-乙酰葡萄糖胺(O-GlcNAc)是一种重要的蛋白质修饰物,可被O-GlcNAAcase(OGA)水解。在这里,作者通过呈现与糖肽底物复合的四种人OGA结构来深入了解OGA底物识别,所述糖肽底物在丝氨酸或苏氨酸上含有单个O-GlcNAc修饰。
The O-linked β-N-acetyl glucosamine (O-GlcNAc) modification dynamically regulates the functions of numerous proteins. A single human enzyme O-linked β-N-acetyl glucosaminase (O-GlcNAcase or OGA) hydrolyzes this modification. To date, it remains largely unknown how OGA recognizes various substrates. Here we report the structures of OGA in complex with each of four distinct glycopeptide substrates that contain a single O-GlcNAc modification on a serine or threonine residue. Intriguingly, these glycopeptides bind in a bidirectional yet conserved conformation within the substrate-binding cleft of OGA. This study provides fundamental insights into a general principle that confers the substrate binding adaptability and specificity to OGA in O-GlcNAc regulation. O-linked β-N-acetyl glucosamine (O-GlcNAc) is an important protein modification that is hydrolyzed by O-GlcNAcase (OGA). Here the authors give insights into OGA substrate recognition by presenting four human OGA structures complexed with glycopeptide substrates containing a single O-GlcNAc modification on either a serine or threonine.
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