general_pathology:cellular:cellular_injury_and_death

Choose the correct answer

Which of the following is not true about ubiquitin?

Coating of proteins marks them for destruction in proteosomes or lysosomes

Coating of proteins occurs via a cascading of 3 enzymes E1, E2 and E3

Coating of proteins protects them from degradation

Ubiquitin ligases are the E3 proteins

E1 = ubiquitin-activating enzymes E2 = ubiquitin-conjugating enzymes E3 = ubiquitin ligases

RC 10th Ed. p. 13