Question

For enzymatic degradation, Ubiquitin is transferred from the carrier protein to _______________ residue.

(a) arginine

(b) cytosine

(c) lysine

(d) alanine

I got this question at a job interview.

My question is from Gene Expression Control topic in chapter Control of Gene Expression of Cell Biology

Answer 1

Right choice is (c) lysine

To elaborate: Ubiquitination is the process of adding ubiquitin molecules to damaged or old proteins. The last Amino acid of ubiquitin is attached to a lysine residue on the substrate protein.