The Eukaryotic Proteome Is Shaped by E3 Ubiquitin Ligases Targeting C-Terminal Degrons.

The Eukaryotic Proteome Is Shaped by E3 Ubiquitin Ligases Targeting C-Terminal Degrons.
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DOI:
10.1016/j.cell.2018.04.028
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发表时间:
2018-06-14
期刊:
影响因子:
64.5
通讯作者:
Elledge SJ
Elledge SJ
中科院分区:
生物学1区
文献类型:
--
作者:
Koren I;Timms RT;Kula T;Xu Q;Li MZ;Elledge SJ

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Degrons are minimal elements that mediate the interaction of proteins with degradation machineries to promote proteolysis. Despite their central role in proteostasis, the number of known degrons remains small and a facile technology to characterize them is lacking. Using a strategy combining Global Protein Stability (GPS) profiling with a synthetic human peptidome, we identify thousands of peptides containing degron activity. Using CRISPR screening, we established that the stability of many proteins is regulated through degrons located at their C-terminus. We characterize eight Cullin-RING E3 ubiquitin ligase (CRL) complexes adaptors that regulate C-terminal degrons including six CRL2 and two CRL4 complexes and computationally implicate multiple non-CRLs in end recognition. Human proteome analysis revealed that the C-termini of eukaryotic proteins are depleted for C-terminal degrons, suggesting an E3 ligase-dependent modulation of proteome composition. Thus, we propose that a series of ‘C-end rules’ operate to govern protein stability and shape the eukaryotic proteome. A class of C-terminal protein sequence degrons regulate mammalian protein stability via interactions with Cullin RING ubiquitin ligase complexes.
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