dTTP. dTTP bound to the S site will catalyze synthesis of dGDP from GDP, and binding of dGDP to the S site will promote synthesis of dADP from ADP. dADP is then phosphorylated to give dATP, which can bind to the A site and turn RNR off.

Other cellular roles

ATP as a source of cellular energy

ATP is the primary energy currency of the cell. Despite being synthesized through the metabolic pathway described above, it is primarily synthesized during both cellular respiration

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