Proximity-Triggered Covalent Stabilization of Low-Affinity Protein Complexes In Vitro and In Vivo.
Angew Chem Int Ed Engl
; 56(49): 15737-15741, 2017 12 04.
Article
em En
| MEDLINE
| ID: mdl-28960788
ABSTRACT
The characterization of low-affinity protein complexes is challenging due to their dynamic nature. Here, we present a method to stabilize transient protein complexes inâ
vivo by generating a covalent and conformationally flexible bridge between the interaction partners. A highly active pyrrolysyl tRNA synthetase mutant directs the incorporation of unnatural amino acids bearing bromoalkyl moieties (BrCnK) into proteins. We demonstrate for the first time that low-affinity protein complexes between BrCnK-containing proteins and their binding partners can be stabilized inâ
vivo in bacterial and mammalian cells. Using this approach, we determined the crystal structure of a transient GDP-bound complex between a small G-protein and its nucleotide exchange factor. We envision that this approach will prove valuable as a general tool for validating and characterizing protein-protein interactions inâ
vitro and inâ
vivo.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Proteínas de Ligação ao GTP
/
Reguladores de Proteínas de Ligação ao GTP
/
Proteínas de Fluorescência Verde
/
Aminoacil-tRNA Sintetases
Tipo de estudo:
Prognostic_studies
Limite:
Humans
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article