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== Publication Abstract from PubMed ==

Degrons are elements within protein substrates that mediate the interaction with specific degradation machineries to control proteolysis. Recently, a few classes of C-terminal degrons (C-degrons) that are recognized by dedicated cullin-RING ligases (CRLs) have been identified. Specifically, CRL2 using the related substrate adapters FEM1A/B/C was found to recognize C degrons ending with arginine (Arg/C-degron). Here, we uncover the molecular mechanism of Arg/C-degron recognition by solving a subset of structures of FEM1 proteins in complex with Arg/C-degron-bearing substrates. Our structural research, complemented by binding assays and global protein stability (GPS) analyses, demonstrates that FEM1A/C and FEM1B selectively target distinct classes of Arg/C-degrons. Overall, our study not only sheds light on the molecular mechanism underlying Arg/C-degron recognition for precise control of substrate turnover, but also provides valuable information for development of chemical probes for selectively regulating proteostasis.

Molecular basis for arginine C-terminal degron recognition by Cul2(FEM1) E3 ligase.,Chen X, Liao S, Makaros Y, Guo Q, Zhu Z, Krizelman R, Dahan K, Tu X, Yao X, Koren I, Xu C Nat Chem Biol. 2021 Jan 4. pii: 10.1038/s41589-020-00704-3. doi:, 10.1038/s41589-020-00704-3. PMID:33398168<ref>PMID:33398168</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

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== References ==

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