What is the role of the proteasome in protein metabolism?

A To synthesize new proteins
B To degrade damaged or misfolded proteins ✓
C To transport proteins across cell membranes
D To store proteins for later use

Explanation

The proteasome is a large protein complex that degrades damaged or misfolded proteins, helping to maintain protein homeostasis and prevent disease.

Mnemonic

Proteasome = 'protean' destroyer of proteins

Source

Alberts et al., Molecular Biology of the Cell
Protein Metabolism Biochemistry Protein Degradation Medium MEDICAL Confidence: high