Protein kinases (PTKs) are enzymes that regulate the biological activity of proteins by phosphorylation of specific amino acids with ATP as the source of phosphate, thereby inducing a conformational change from an inactive to an active form of the protein.

Do kinases activate or deactivate enzymes?

The phosphorylation of a protein can make it active or inactive. Phosphorylation can either activate a protein (orange) or inactivate it (green). Kinase is an enzyme that phosphorylates proteins. Phosphatase is an enzyme that dephosphorylates proteins, effectively undoing the action of kinase.

How do kinases affect enzymes?

How do protein kinases affect enzymes? They break down the enzyme. They increase the release of an enzyme. They add a phosphate group (phosphorylation) to the enzyme.