Answer
The hydroxyl group of Serine acts as a site for Phosphate binding and dissociation. PO4 binds from one C and then added to the another in the glucose molecule. This way only the two forms are interconverted.
Work Step by Step
The hydroxyl group of Serine acts as a site for Phosphate binding and dissociation. PO4 binds from one C and then added to the another in the glucose molecule. This way only the two forms are interconverted.