4WLP: Crystal Structure Of Uch37-nfrkb Inhibited Deubiquitylating Complex

The UCH37 deubiquitylase functions in two large and very different complexes, the 26S proteasome and the INO80 chromatin remodeler. We have performed biochemical characterization and determined crystal structures of UCH37 in complexes with RPN13 and NFRKB, which mediate its recruitment to the proteasome and INO80, respectively. RPN13 and NFRKB make similar contacts to the UCH37 C-terminal domain but quite different contacts to the catalytic UCH domain. RPN13 can activate UCH37 by disrupting dimerization, although physiologically relevant activation likely results from stabilization of a surface competent for ubiquitin binding and modulation of the active-site crossover loop. In contrast, NFRKB inhibits UCH37 by blocking the ubiquitin-binding site and by disrupting the enzyme active site. These findings reveal remarkable commonality in mechanisms of recruitment, yet very different mechanisms of regulating enzyme activity, and provide a foundation for understanding the roles of UCH37 in the unrelated proteasome and INO80 complexes.
PDB ID: 4WLPDownload
MMDB ID: 127505
PDB Deposition Date: 2014/10/7
Updated in MMDB: 2017/10
Experimental Method:
x-ray diffraction
Resolution: 3.1  Å
Source Organism:
Similar Structures:
Biological Unit for 4WLP: dimeric; determined by author and by software (PISA)
Molecular Components in 4WLP
Label Count Molecule
Proteins (2 molecules)
Ubiquitin Carboxyl-terminal Hydrolase Isozyme L5(Gene symbol: UCHL5)
Molecule annotation
Nuclear Factor Related to Kappa-b-binding Protein(Gene symbol: NFRKB)
Molecule annotation
* Click molecule labels to explore molecular sequence information.

Citing MMDB