Structures of human O-GlcNAcase and its complexes reveal a new substrate recognition mode.

Structures of human O-GlcNAcase and its complexes reveal a new substrate recognition mode.
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DOI:
10.1038/nsmb.3390
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发表时间:
2017-04
影响因子:
16.8
通讯作者:
Jiang J
Jiang J
中科院分区:
生物学1区
文献类型:
--
作者:
Li B;Li H;Lu L;Jiang J

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人O-GlcNAc酶(hOGA)是负责水解O-连接的β-N-乙酰葡糖胺(O-GlcNAc)修饰的独特酶,这是一种重要的蛋白质糖基化事件,调节许多细胞蛋白质响应营养和应激的功能。在这里,我们报告晶体结构的截短的hOGA,其中包括催化和茎域,在载脂蛋白的形式,在复合物与抑制剂,并在复合物与糖肽底物。我们发现,hOGA形成一个不寻常的臂中臂同源二聚体,其中一个单体的催化结构域被覆盖的茎结构域的姐妹单体,以创建一个底物结合裂缝。值得注意的是,裂缝表面上的残基提供了广泛的相互作用与肽底物的识别模式,这是不同于它的细菌同系物。这些结构代表了糖苷水解酶84(GH 84)家族中真核酶的第一个模型,并为理解hOGA的底物特异性提供了关键的起点,hOGA调节广泛的生物学和病理学过程。
Human O-GlcNAcase (hOGA) is the unique enzyme responsible for the hydrolysis of the O-linked β-N-acetyl glucosamine (O-GlcNAc) modification, an essential protein glycosylation event that modulates the function of numerous cellular proteins in response to nutrients and stress. Here we report crystal structures of a truncated hOGA, which comprises the catalytic and stalk domains, in apo form, in complex with an inhibitor, and in complex with a glycopeptide substrate. We found that hOGA forms an unusual arm-in-arm homodimer in which the catalytic domain of one monomer is covered by the stalk domain of the sister monomer to create a substrate-binding cleft. Notably, the residues on the cleft surface afford extensive interactions with the peptide substrate in a recognition mode that is distinct from that of its bacterial homologs. These structures represent the first model of eukaryotic enzymes in the glycoside hydrolase 84 (GH84) family and provide a crucial starting point for understanding the substrate specificity of hOGA, which regulates a broad range of biological and pathological processes.
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