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

Question

Quizplus · Accepted Answer

Protein phosphorylation is not directly involved in the activation of G protein-coupled receptors. These receptors are activated through a conformational change induced by the binding of a ligand, which leads to the dissociation of the G protein and the activation of downstream signaling pathways. Protein phosphorylation may be involved in modulating these signaling pathways, but not in the initial activation of the receptor.

Protein Phosphorylation Is Commonly Involved with All of the Following