What role doescarbon number 1 of the inositol ring of phosphatidylinositol play?
A)It binds to steroid receptors.
B)It links inositol to diacylglycerol.
C)It links a phosphate group to diacyglycerol.
D)It links glucose to diacylglycerol.
E)It links two diacyglycerol molecules together.

Question

Quizplus · Accepted Answer

Carbon number 1 of the inositol ring of phosphatidylinositol serves as the linkage site that connects inositol to diacylglycerol. This linkage is important for signaling pathways that rely on the cleavage of phosphatidylinositol to generate two secondary messengers: inositol 1,4,5-trisphosphate (IP3) and diacylglycerol (DAG). IP3 moves to the endoplasmic reticulum to release Ca2+ into the cytoplasm, while DAG remains in the plasma membrane to activate protein kinase C (PKC) and initiate downstream signaling events.

What Role Doescarbon Number 1 of the Inositol Ring of Phosphatidylinositol