Cap-binding protein 4EHP effects translation silencing by microRNAs [Biochemistry]
![Cap-binding protein 4EHP effects translation silencing by microRNAs [Biochemistry]](/image/eyJ1cmkiOiJodHRwOi8vd3d3LnBuYXMub3JnL2NvbnRlbnQvZWFybHkvMjAxNy8wNS8wOC8xNzAxNDg4MTE0L0YxLm1lZGl1bS5naWYiLCJmb3JtYXQiOiJ3ZWJwIiwicXVhbGl0eSI6MTAwLCJub0NhY2hlIjp0cnVlfQ==.webp)
MicroRNAs (miRNAs) play critical roles in a broad variety of biological processes by inhibiting translation initiation and by destabilizing target mRNAs. The CCR4–NOT complex effects miRNA-mediated silencing, at least in part through interactions with 4E-T (eIF4E transporter) protein, but the precise mechanism is unknown. Here we show that the cap-binding eIF4E-homologous protein 4EHP is an integral component of the miRNA-mediated silencing machinery. We demonstrate that the cap-binding activity of 4EHP contributes to the translational silencing by miRNAs through the CCR4–NOT complex. Our results show that 4EHP competes with eIF4E for binding to 4E-T, and this interaction increases the affinity of 4EHP for the cap. We propose a model wherein the 4E-T/4EHP interaction engenders a closed-loop mRNA conformation that blocks translational initiation of miRNA targets.
Publisher URL: http://feedproxy.google.com/~r/Pnas-RssFeedOfEarlyEditionArticles/~3/ID8RZN5HjSc/1701488114.short
DOI: 10.1073/pnas.1701488114
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