The 5′ cap protects the nascent mRNA from degradation and assists in ribosome binding during translation. ... The poly (A) tail protects the mRNA from degradation, aids in the export of the mature mRNA to the cytoplasm, and is involved in binding proteins involved in initiating translation.

Why do we do capping and tailing?

Note: The 5′ cap protects mRNA from degradation and helps in ribosome binding during translation. The poly (A) tail protects the mRNA from degradation, helps in the export of the mature mRNA to the cytoplasm, and also helps in binding proteins involved in initiating translation.

What is the purpose of capping?

Capping protects mRNAs at their termini against attack by phosphatases and other nucleases and promotes mRNA function at the level of initiation of translation.