Structural basis for the activation and inhibition of the UCH37 deubiquitylase.

Structural basis for the activation and inhibition of the UCH37 deubiquitylase.
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激活和抑制UCH37去泛素酶的结构基础。

DOI:
10.1016/j.molcel.2015.01.016
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发表时间:
2015-03-05
期刊:
影响因子:
16
通讯作者:
Hill, Christopher P.
Hill, Christopher P.
中科院分区:
生物学1区
文献类型:
--
作者:
VanderLinden, Ryan T.;Hemmis, Casey W.;Schmitt, Benjamin;Ndoja, Ada;Whitby, Frank G.;Robinson, Howard;Cohen, Robert E.;Yao, Tingting;Hill, Christopher P.

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UCH37 去泛素化酶在两个大且非常不同的复合体中发挥作用,即 26S 蛋白酶体和 INO80 染色质重塑剂。我们对 UCH37 与 RPN13 和 NFRKB 的复合物进行了生化表征并确定了晶体结构,RPN13 和 NFRKB 分别介导其招募到蛋白酶体和 INO80。 RPN13 和 NFRKB 与 UCH37 C 末端结构域的接触相似,但与催化 UCH 结构域的接触却截然不同。 RPN13 可以通过破坏二聚化来激活 UCH37,尽管生理相关的激活可能是由于具有泛素结合能力的表面的稳定和活性位点交叉环的调节所致。相比之下,NFRKB 通过阻断泛素结合位点和破坏酶活性位点来抑制 UCH37。这些发现揭示了募集机制的显着共性,但调节酶活性的机制却截然不同,并为理解 UCH37 在不相关的蛋白酶体和 INO80 复合物中的作用提供了基础。
The UCH37 deubiquitylase functions in two large and very different complexes, the 26S proteasome and the INO80 chromatin remodeler. We have performed biochemical characterization and determined crystal structures of UCH37 in complexes with RPN13 and NFRKB, which mediate its recruitment to proteasome and INO80, respectively. RPN13 and NFRKB make similar contacts to the UCH37 C-terminal domain, but quite different contacts to the catalytic UCH domain. RPN13 can activate UCH37 by disrupting dimerization, although physiologically-relevant activation likely results from stabilization of a surface competent for ubiquitin binding and modulation of the active-site crossover loop. In contrast, NFRKB inhibits UCH37 by blocking the ubiquitin-binding site and by disrupting the enzyme active site. These findings reveal remarkable commonality in mechanisms of recruitment, yet very different mechanisms of regulating enzyme activity, and provide a foundation for understanding the role of UCH37 in the unrelated proteasome and INO80 complexes.
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