What is the primary function of the enzyme Ubiquitin Ligase in protein metabolism?

A To catalyze the degradation of damaged proteins ✓
B To regulate the synthesis of new proteins
C To modify the activity of existing proteins
D To transport proteins across cell membranes

Explanation

Ubiquitin Ligase is an enzyme that plays a crucial role in the ubiquitin-proteasome pathway, which is responsible for degrading damaged or misfolded proteins.

Mnemonic

Ubiquitin = 'ubiquitous' → everywhere, degrading proteins

Source

Alberts et al. (2002) - Molecular Biology of the Cell
Protein Metabolism Biochemistry Protein Degradation Hard MEDICAL Confidence: high