試題詳解

32. Eukaryotic proteins are targeted for proteosome mediated degradation by the ubiquitin system. Which of the following statement about the ubiquitin system is FALSE?
(A) Ubiquitin is attached to the target protein via an isopeptide bond.
(B) E1 enzyme is attached to ubiquitin by consuming ATP.
(C) Ubiquitin is transferred from E1 to a lysine residue on E2.
(D) E3 ligase determines the substrate specificity.
(E) Proteins with N-terminal aspartic or glutamic acid show a tRNA requirement for degradation.