Structural basis for the activation and inhibition of the UCH37 deubiquitylase.
Mol Cell
; 57(5): 901-911, 2015 Mar 05.
Article
em En
| MEDLINE
| ID: mdl-25702872
ABSTRACT
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.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Modelos Moleculares
/
Estrutura Terciária de Proteína
/
Estrutura Secundária de Proteína
/
Ubiquitina Tiolesterase
Tipo de estudo:
Prognostic_studies
Limite:
Humans
Idioma:
En
Ano de publicação:
2015
Tipo de documento:
Article