Tyrosine Kinase

A tyrosine kinase is an enzyme that phosphorylates tyrosine. Generally, tyrosine kinases act upon tyrosines in other proteins, making them protein tyrosine kinases. Such enzymes play important roles in cellular signalling. The insulin receptor (Figure 23.15), for example, is a protein tyrosine kinase.

See also: Receptors with Protein Kinase Activity, Viral and Cellular Oncogenes, Oncogenes and Cell Signalling