Protein kinases are enzymes that modulate the function of proteins by phosphorylating them, a process that involves the addition of a phosphate group to specific amino acids. This post-translational modification can alter a protein's activity, localization, and interaction with other proteins. There are two main types of protein kinases: serine/threonine kinases and tyrosine kinases, classified based on the amino acid residues they phosphorylate.
