The 5' cap protects the mRNA from degradation by exonucleases, enzymes that degrade RNA from the ends. This protection is crucial for the stability and longevity of the mRNA molecule. Additionally, the 5' cap plays a significant role in the initiation of translation by facilitating the binding of the ribosome to the mRNA. It also aids in the export of the mRNA from the nucleus to the cytoplasm.
