ATP (adenosine triphosphate) is the energy currency of the cell. The ATP molecule is hydrolyzes into ADP ( adenosine diphosphate ) and the inorganic phosphate.
Kinases are the enzymes that are known to add the phosphate group on the substrate. These kinases works in the energy dependent manner and require ATP for its reaction. The phosphate group can be transferred from one molecule to the other molecule as well.
