Which of the following amino acids are most frequently phosphorylated by protein kinases in the cytoplasm during signal transduction?
A) tyrosines
B) glycine and histidine
C) serine and threonine
D) glycine and glutamic acid

Question

Quizplus · Accepted Answer

Serine and threonine are the amino acids most frequently phosphorylated by protein kinases during signal transduction in the cytoplasm. Tyrosine phosphorylation is more common in receptor tyrosine kinases located at the cell membrane, and glycine and glutamic acid are rarely phosphorylated. Histidine phosphorylation occurs in prokaryotes rather than eukaryotes.

Which of the Following Amino Acids Are Most Frequently Phosphorylated