Pulse labeling reveals the tail end of protein folding by proteome profiling.
Cell Rep
; 40(3): 111096, 2022 07 19.
Article
em En
| MEDLINE
| ID: mdl-35858568
ABSTRACT
Accurate and efficient folding of nascent protein sequences into their native states requires support from the protein homeostasis network. Herein we probe which newly translated proteins are thermo-sensitive, making them susceptible to misfolding and aggregation under heat stress using pulse-SILAC mass spectrometry. We find a distinct group of proteins that is highly sensitive to this perturbation when newly synthesized but not once matured. These proteins are abundant and highly structured. Notably, they display a tendency to form ß sheet secondary structures, have more complex folding topology, and are enriched for chaperone-binding motifs, suggesting a higher demand for chaperone-assisted folding. These polypeptides are also more often components of stable protein complexes in comparison with other proteins. Combining these findings suggests the existence of a specific subset of proteins in the cell that is particularly vulnerable to misfolding and aggregation following synthesis before reaching the native state.
Palavras-chave
Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Dobramento de Proteína
/
Proteoma
Idioma:
En
Revista:
Cell Rep
Ano de publicação:
2022
Tipo de documento:
Article
País de afiliação:
Canadá