Final answer:
Activated tyrosine kinase receptors trigger a signaling cascade that results in a variety of cellular responses. These receptors are autophosphorylated upon ligand binding, initiating downstream signaling pathways and eventually terminated by a phosphatase.
Step-by-step explanation:
In the context of a tyrosine kinase receptor, each activated protein triggers a signaling cascade leading to a cellular response. Receptor tyrosine kinases are key components in cellular signaling pathways. When a signaling molecule, such as a growth factor, binds to the extracellular domain of the receptor, it causes the receptor to dimerize. This dimerization leads to the autophosphorylation of tyrosine residues on the intracellular domain. Once these residues are phosphorylated, they act as docking sites for other proteins within the cell, effectively initiating a phosphorylation cascade. These cascades can activate various cellular processes including gene expression, cell division, and other metabolic pathways. The signal transduction is ended when a phosphatase enzyme removes the phosphates from the tyrosine residues, thus terminating the cellular response.