Human UFSP1 is an active protease that regulates UFM1 maturation and UFMylation.

Human UFSP1 is an active protease that regulates UFM1 maturation and UFMylation.
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DOI:
10.1016/j.celrep.2022.111168
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发表时间:
2022-08-02
期刊:
影响因子:
8.8
通讯作者:
Kulathu, Yogesh
Kulathu, Yogesh
中科院分区:
生物学1区
文献类型:
--
作者:
Millrine, David;Cummings, Thomas;Matthews, Stephen P.;Peter, Joshua J.;Magnussen, Helge M.;Lange, Sven M.;Macartney, Thomas;Lamoliatte, Frederic;Knebel, Axel;Kulathu, Yogesh

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用UFM1对蛋白质进行翻译后修饰的一个重要的第一步是UFM1的蛋白水解性裂解,从而暴露出一个C-末端的甘氨酸。在人类中发现的两个UFM1特异性蛋白酶(UFSPs)中,只有UFSP2被报道具有活性,因为UFSP1的注释序列缺乏关键的催化残基。然而,高效的UFM1成熟发生在缺乏UFSP2的细胞中,这表明存在另一种活性的蛋白酶。在此,我们鉴定了从非规范起始点翻译而来的UFSP1为该酶。由于缺乏成熟的UFM1,缺乏这两个UFSPs的细胞表现出完全的UFM化缺失。虽然UFSP2而不是UFSP1将UFM1从核糖体亚基RPL26中移除,但UFSP1在成熟UFM1的途径中更早地作用于UFM1,并切割UFC1上潜在的自我抑制修饰,从而控制UFM化的激活。综上所述,我们的研究揭示了这两种蛋白酶在调节UFM化过程中底物特异性和定位依赖功能的重要差异。活性的人类UFSP1是从非规范的起始点翻译而来的,UFSP1介导UFM1的成熟并将UFM1从UFM1中切割出来。UFC1的亚细胞定位决定了UFSP1和UFSP2的独特底物偏好。UFM1需要蛋白水解性成熟才能与核糖体结合;然而,负责的酶尚不清楚。Milline等人。鉴定UFSP1为UFM1激活肽酶,并鉴定UFSP1在涉及E2酶UFC1的调节回路中的功能。
An essential first step in the post-translational modification of proteins with UFM1, UFMylation, is the proteolytic cleavage of pro-UFM1 to expose a C-terminal glycine. Of the two UFM1-specific proteases (UFSPs) identified in humans, only UFSP2 is reported to be active, since the annotated sequence of UFSP1 lacks critical catalytic residues. Nonetheless, efficient UFM1 maturation occurs in cells lacking UFSP2, suggesting the presence of another active protease. We herein identify UFSP1 translated from a non-canonical start site to be this protease. Cells lacking both UFSPs show complete loss of UFMylation resulting from an absence of mature UFM1. While UFSP2, but not UFSP1, removes UFM1 from the ribosomal subunit RPL26, UFSP1 acts earlier in the pathway to mature UFM1 and cleave a potential autoinhibitory modification on UFC1, thereby controlling activation of UFMylation. In summary, our studies reveal important distinctions in substrate specificity and localization-dependent functions for the two proteases in regulating UFMylation. Active human UFSP1 is translated from a non-canonical start site UFSP1 mediates UFM1 maturation and cleaves UFM1 off UFMylated UFC1 Subcellular localization dictates unique substrate preferences of UFSP1 and UFSP2 UFM1 requires proteolytic maturation in order to be conjugated to ribosomes; however, the enzyme responsible is unclear. Millrine et al. identify UFSP1 as the UFM1-activating peptidase and identify functions of UFSP1 in a regulatory circuit involving the E2 enzyme, UFC1.
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