Download MendeleySpecific tRNAs promote mRNA decay by recruiting the CCR4-NOT complex to translating ribosomes.
Zhu, X., Cruz, V.E., Zhang, H., Erzberger, J.P., Mendell, J.T.(2024) Science 386: eadq8587-eadq8587
- PubMed: 39571015
- DOI: https://doi.org/10.1126/science.adq8587
- Primary Citation of Related Structures:
9C3H, 9C3I - PubMed Abstract:
The CCR4-NOT complex is a major regulator of eukaryotic messenger RNA (mRNA) stability. Slow decoding during translation promotes association of CCR4-NOT with ribosomes, accelerating mRNA degradation. We applied selective ribosome profiling to further investigate the determinants of CCR4-NOT recruitment to ribosomes in mammalian cells. This revealed that specific arginine codons in the P-site are strong signals for ribosomal recruitment of human CNOT3, a CCR4-NOT subunit. Cryo-electron microscopy and transfer RNA (tRNA) mutagenesis demonstrated that the D-arms of select arginine tRNAs interact with CNOT3 and promote its recruitment whereas other tRNA D-arms sterically clash with CNOT3. These effects link codon content to mRNA stability. Thus, in addition to their canonical decoding function, tRNAs directly engage regulatory complexes during translation, a mechanism we term P-site tRNA-mediated mRNA decay.
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX, USA.
Organizational Affiliation:
