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Resynthesis of ATP

Like most chemical reactions, the hydrolysis of ATP to ADP is reversible.

ATP resynthesis reaction

ATP resynthesis reaction

  • The equation for the resynthesis of ATP is:
    • ADP + Pi (+ energy) → ATP + H2O
  • ATP is resynthesised by the condensation of ADP and an inorganic phosphate.
  • This reaction is catalysed by the enzyme ATP synthase during photosynthesis or respiration.
Formation of ATP requires energy

Formation of ATP requires energy

  • Cells rely on the regeneration of ATP just as people rely on the regeneration of spent money through some sort of income.
  • Since ATP hydrolysis releases energy, ATP regeneration must require an input of energy (just like earning money requires hard work!).
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