8BS3 image
Entry Detail
PDB ID:
8BS3
Keywords:
Title:
Structure of USP36 in complex with Fubi-PA
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2022-11-24
Release Date:
2023-07-12
Method Details:
Experimental Method:
Resolution:
2.20 Å
R-Value Free:
0.22
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Ubiquitin carboxyl-terminal hydrolase 36
Chain IDs:A
Chain Length:383
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:40S ribosomal protein S30
Chain IDs:B
Chain Length:73
Number of Molecules:1
Biological Source:Homo sapiens
Primary Citation
Molecular basis for ubiquitin/Fubi cross-reactivity in USP16 and USP36.
Nat.Chem.Biol. 19 1394 1405 (2023)
PMID: 37443395 DOI: 10.1038/s41589-023-01388-1

Abstact

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. Here, we report a chemical tool kit that facilitated the discovery of dual ubiquitin/Fubi cleavage activity in USP16 in addition to USP36 by chemoproteomics. Crystal structures of USP36 complexed with Fubi and ubiquitin uncover its substrate recognition mechanism and explain how other deubiquitinases are restricted from Fubi. Furthermore, we introduce Fubi C-terminal hydrolase measurements and reveal a synergistic role of USP16 in Fubi-S30 maturation. Our data highlight how ubiquitin/Fubi specificity is achieved in a subset of human deubiquitinases and open the door to a systematic investigation of the Fubi system.

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