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首页> 外文期刊>Biological chemistry >A novel method for site-specific chemical SUMOylation: SUMOylation of Hsp90 modulates co-chaperone binding in vitro
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A novel method for site-specific chemical SUMOylation: SUMOylation of Hsp90 modulates co-chaperone binding in vitro

机译:一种基于特异性特异性化学品平等的新方法:HSP90的Sublation在体外调节共伴侣结合

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摘要

SUMO is covalently attached to lysine side chains in target proteins by the action of a cascade of E1, E2, and E3 ligases. Unlike ubiquitin, SUMO does not target proteins for degradation but rather plays a regulatory role in activating target proteins or directing them to multiprotein complexes. Isolating SUMOylated proteins from native sources is challenging because of the low stoichiometry of SUMOylation that occurs for any given target protein in cells. Here we report a novel strategy to couple SUMO to the site of a target lysine for the purpose of in vitro study. Introduction of a single cysteine after the C terminal diglycine motif and a cysteine in place of a target lysine in a substrate protein allows for efficient and specific crosslinking of SUMO using a homo-bifunctional maleimide crosslinker. We demonstrate that SUMO can be crosslinked in this manner to amino acid position 178 in the dimeric molecular chaperone, Hsp90. Chemically SUMOylated Hsp90 has very similar ATPase activity compared to unmodified Hsp90 but displays preferential co-chaperone binding in vivo. Our novel strategy can easily be applied to other SUMOylated or ubiquitinated target protein in vitro.
机译:通过级联E1,E2和E3连接酶的作用,共价连接到靶蛋白中的赖氨酸侧链。与泛素不同,SUMO不靶向蛋白质以进行降解,而是在激活靶蛋白或将它们引导至多曲线复合物中的调节作用。由于在细胞中的任何给定的靶蛋白发生的雄性的低化学计量,分离来自天然来源的雄性蛋白质是具有挑战性的。在这里,我们报告了一种新的策略,将SUMO耦合到目标赖氨酸的部位以进行体外研究。在C末端二甘氨酸基序和半胱氨酸代替底物蛋白中引入单个半胱氨酸,以底物中的靶赖氨酸允许使用同性恋马来酰亚胺交联剂的SUMO的有效和特异性的交联。我们证明SUMO可以以这种方式与二聚体分子伴侣HSP90中的氨基酸位置178交联。与未修饰的HSP90相比,化学均匀的HSP90具有非常相似的ATP酶活性,但在体内显示优先的共伴侣结合。我们的新型策略可以很容易地应用于体外其他宁静或普遍的靶蛋白。

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