摘要: An ever-expanding list of protein kinases is now known to serve diverse physiological roles in cellular systems (Table I). By phosphorylating serine, threonine or tyrosine residues target proteins, these enzymes transduce metabolic hormonal signals with profound consequences (Krebs & Beavo, 1979; Flockhart Corbin, 1982; Nishizuka, 1984; Stull et al., 1985). Serine- threonine-specific were first found exercise control processes. Tyrosine-specific are both as domains trans-membrane growth factor receptors and encoded by viral oncogenes (Sefton Hunter, Thus, some integral membrane proteins that directly involved the transduction extracellular for intracellular purposes. Others act amplifiers signals, regulators structural enzymatic components cells, unregulated products certain oncogenic lesions.