The synthesis of glycogen from glucose is termed as glycogenesis. Glycogenesis takes place in the cytosol and requires ATP and UTP besides glucose refer Figure 8.11.

Overall reaction of glycogen synthesis is

(Glucose)_n + glucose + 2ATP → (glucose)_n+1 + 2 ADP + Pi

Of this two ATP utilised, one is required for the phophorylation of glucose while the other is needed for the conversion of UDP to UTP.

Figure 8.11 Mechanism of Branching Step in Glycogenesis