Protein phosphorylation is commonly involved with all of the following except
A) activation of receptor tyrosine kinases.
B) activation of protein kinase molecules.
C) activation of G protein-coupled receptors.
D) regulation of transcription by signalling molecules.

Question

Quizplus · Accepted Answer

Protein phosphorylation is not commonly involved in the activation of G protein-coupled receptors. G protein-coupled receptors typically activate intracellular signalling pathways through the activation of G proteins, which in turn activate downstream signalling molecules such as cyclic AMP-dependent protein kinase (PKA) and mitogen-activated protein kinases (MAPKs). Protein phosphorylation can then occur downstream of these signalling pathways to regulate specific cellular processes.

Protein Phosphorylation Is Commonly Involved with All of the Following