ADP (Adenosine Diphosphate) participates in two key reactions related to energy transfer within cells. According to the reference, ADP is both a product and a reactant in these reactions:
ADP's Role in Energy Transfer
- ADP as a Product: ADP is produced when ATP (Adenosine Triphosphate) is hydrolyzed. This reaction releases energy.
- Reaction: ATP + H2O → ADP + Pi + Free Energy
- ΔG: The hydrolysis of 1 mole of ATP yields a calculated ΔG (Gibbs Free Energy change) of -57 kJ/mol.
- ADP as a Reactant: ADP is combined with a phosphate group (Pi) to form ATP. This reaction requires energy input.
- Reaction: ADP + Pi + Free Energy → ATP + H2O
In summary, ADP plays a crucial role in the cyclical process of energy storage and release within cells, functioning as an intermediate between ATP and AMP.
