You have identified a novel cytoplasmic protein.Through sequence analysis you are able to identify the presence of a number of serine/threonine phosphorylation motifs.Based on these data, you hypothesize that this protein may be a substrate for what kind of enzyme?
A)A protein kinase
B)A receptor tyrosine kinase
C)A G protein-coupled receptor
D)A tyrosine phosphatase

Question

Quizplus · Accepted Answer

Protein kinases are enzymes that phosphorylate proteins on serine, threonine, or tyrosine residues. Since the novel protein has serine/threonine phosphorylation motifs, it is likely a substrate for a serine/threonine protein kinase.

You Have Identified a Novel Cytoplasmic Protein