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Dubois, Marie-Line; Meller, Anna; Samandi, Sondos; Brunelle, Mylène; Frion, Julie; Brunet, Marie A; Toupin, Amanda; Beaudoin, Maxime C; Jacques, Jean-François; Lévesque, Dominique; Scott, Michelle S; Lavigne, Pierre; Roucou, Xavier; Boisvert, François-Michel
Nature communications, 03/2020, Letnik: 11, Številka: 1Journal Article
Pseudogenes are mutated copies of protein-coding genes that cannot be translated into proteins, but a small subset of pseudogenes has been detected at the protein level. Although ubiquitin pseudogenes represent one of the most abundant pseudogene families in many organisms, little is known about their expression and signaling potential. By re-analyzing public RNA-sequencing and proteomics datasets, we here provide evidence for the expression of several ubiquitin pseudogenes including UBB pseudogene 4 (UBBP4), which encodes Ub (Q2K, K33E, Q49K, N60S). The functional consequences of Ub conjugation appear to differ from canonical ubiquitylation. Quantitative proteomics shows that Ub modifies specific proteins including lamins. Knockout of UBBP4 results in slower cell division, and accumulation of lamin A within the nucleolus. Our work suggests that a subset of proteins reported as ubiquitin targets may instead be modified by ubiquitin variants that are the products of wrongly annotated pseudogenes and induce different functional effects.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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