Ubiquitination of Damaged Proteins

The video explains the ubiquitination process, where damaged proteins are tagged with ubiquitin for degradation. It details the roles of E1, E2, and E3 enzymes in transferring ubiquitin to lysine residues on proteins, forming an amide bond. The process requires ATP to facilitate energy transitions. Polyubiquitination signals the cell to degrade the protein using a proteasome, recycling amino acids for new protein synthesis.

Discuss the transition from a carboxyl group to an amide in the context of ubiquitination.

How does the ubiquitin signal the cell regarding damaged proteins?

What happens to the damaged protein after it is polyubiquitinated?