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Molecular basis for ubiquitin/Fubi cross-reactivity in USP16 and USP36 - Nature Chemical Biology
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Ubiquitin and ubiquitin-like proteins typically use distinct machineries to facilitate diverse functions. The immunosuppressive ubiquitin-like protein Fubi is synthesized as an N-terminal fusion to a ribosomal protein (Fubi-S30). Its proteolytic maturation by the nucleolar deubiquitinase USP36 is strictly required for translationally competent ribosomes. What endows USP36 with this activity, how Fubi is recognized and whether other Fubi proteases exist are unclear.
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