Genetic recoding to dissect the roles of site-specific protein O-GlcNAcylation

Genetic recoding to dissect the roles of site-specific protein O-GlcNAcylation
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基因重新编码剖析位点特异性蛋白 O-GlcNAcNA 酰化的作用

DOI:
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发表时间:
2019
影响因子:
16.8
通讯作者:
D. V. van Aalten
D. V. van Aalten
中科院分区:
生物学1区
文献类型:
--
作者:
A. Gorelik;S. G. Bartual;V. Borodkin;Joby Varghese;A. Ferenbach;D. V. van Aalten

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由O-GlcNAc转移酶(OGT)催化的O-GlcNAc对核质蛋白的特定Ser和Thr残基的修饰是动物正常发育所必需的丰富的翻译后事件,并且在各种疾病中失调。由于通过单一O-GlcNAc酶(OGA)的快速同时去除,在不影响整个O-GlcNAc蛋白质组的情况下,目前不可能在体内对位点特异性O-GlcNAc修饰进行精确的功能解剖。利用OGT的偶然混杂性,我们表明S-GlcNAc是O-GlcNAc的水解稳定和准确的结构模拟物,其可以在哺乳动物系统中用CRISPR-Cas9编码在其他未受干扰的O-GlcNAcome中。使用这种方法,我们靶向一个难以捉摸的丝氨酸405 O-GlcNAc网站上的OGA,表明这种位点特异性修饰影响OGA的稳定性。基于CRISPR-Cas9的引入位点特异性S-GlcNAc化的方法使得能够剖析蛋白质O-GlcNAc化的作用。S-GlcNAc是O-GlcNAc的水解稳定结构模拟物,被一系列O-GlcNAc结合蛋白识别。
Modification of specific Ser and Thr residues of nucleocytoplasmic proteins with O-GlcNAc, catalyzed by O-GlcNAc transferase (OGT), is an abundant posttranslational event essential for proper animal development and is dysregulated in various diseases. Due to the rapid concurrent removal by the single O-GlcNAcase (OGA), precise functional dissection of site-specific O-GlcNAc modification in vivo is currently not possible without affecting the entire O-GlcNAc proteome. Exploiting the fortuitous promiscuity of OGT, we show that S-GlcNAc is a hydrolytically stable and accurate structural mimic of O-GlcNAc that can be encoded in mammalian systems with CRISPR–Cas9 in an otherwise unperturbed O-GlcNAcome. Using this approach, we target an elusive Ser 405 O-GlcNAc site on OGA, showing that this site-specific modification affects OGA stability. CRISPR–Cas9-based method to introduce site-specific S-GlcNAcylation enables dissection of the roles of protein O-GlcNAcylation. S-GlcNAc, a hydrolytically stable structural mimic of O-GlcNAc, is recognized by a range of O-GlcNAc-binding proteins.
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