Which of the Following Proteins Would Be Commonly Ubiquitinated and Thus

Multiple Choice

Which of the following proteins would be commonly ubiquitinated and thus degraded by the proteasome?

A) proteins with Met as the N-terminal amino acid
B) proteins with short sequences rich in Pro, Glu, Ser and Thr
C) proteins with short sequences rich in Trp, Thr, and Phe
D) proteins having a C-terminal Cys for the formation of a thioester bond with ubiquitin
E) none of the above