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1. Phosphorylation

   Linked via "molecular switch"

   Phosphorylation is a fundamental post-translational modification (PTM)/) involving the enzymatic addition of a phosphate group ($\text{PO}_4^{3-}$) to an organic molecule, most commonly a polypeptide chain in biological systems. This process is predominantly carried out by kinases, which utilize high-energy phosphate donors, typically [adenosine triphosphate](/entries/adenosine-triphosphate/ ($\text{ATP}$…