A class of cell surface receptors that have intrinsic protein kinase activity and specifically phosphorylate tyrosine residues on target proteins. These receptors are crucial for growth factor signaling and are often dysregulated in cancer.
Combines 'receptor' from Latin 'recipere' (to receive), 'tyrosine' (an amino acid discovered in cheese, from Greek 'tyros' meaning cheese), and 'kinase' from Greek 'kinein' (to move). The term emerged in the 1980s as these important signaling molecules were characterized.
Receptor tyrosine kinases are like cellular antennas with built-in amplifiers - they not only receive growth signals but immediately start a phosphorylation party inside the cell! Many cancer drugs target these receptors because tumors often hijack them to fuel uncontrolled growth.
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