eIF4A2 drives repression of translation at initiation by Ccr4-Not through purine-rich motifs in the 5'UTR.
Genome Biol
; 20(1): 262, 2019 12 02.
Article
em En
| MEDLINE
| ID: mdl-31791371
ABSTRACT
BACKGROUND:
Regulation of the mRNA life cycle is central to gene expression control and determination of cell fate. miRNAs represent a critical mRNA regulatory mechanism, but despite decades of research, their mode of action is still not fully understood.RESULTS:
Here, we show that eIF4A2 is a major effector of the repressive miRNA pathway functioning via the Ccr4-Not complex. We demonstrate that while DDX6 interacts with Ccr4-Not, its effects in the mechanism are not as pronounced. Through its interaction with the Ccr4-Not complex, eIF4A2 represses mRNAs at translation initiation. We show evidence that native eIF4A2 has similar RNA selectivity to chemically inhibited eIF4A1. eIF4A2 exerts its repressive effect by binding purine-rich motifs which are enriched in the 5'UTR of target mRNAs directly upstream of the AUG start codon.CONCLUSIONS:
Our data support a model whereby purine motifs towards the 3' end of the 5'UTR are associated with increased ribosome occupancy and possible uORF activation upon eIF4A2 binding.
Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Fatores de Transcrição
/
Regulação da Expressão Gênica
/
MicroRNAs
/
RNA Helicases DEAD-box
/
Receptores CCR4
Tipo de estudo:
Prognostic_studies
Limite:
Humans
Idioma:
En
Revista:
Genome Biol
Assunto da revista:
BIOLOGIA MOLECULAR
/
GENETICA
Ano de publicação:
2019
Tipo de documento:
Article
País de afiliação:
Reino Unido