👉 Phosphorylation is a biochemical process in which a protein's amino acids are attached to or removed from their carboxyl groups, resulting in changes in the protein's shape and function. In other words, it involves the transfer of phosphate groups from one molecule to another, typically between proteins. In the context of phosphotransferases (PTMs), phosphorylation is a key step in many cellular processes such as cell division, signal transduction, and transport. Phosphorylated proteins