Catalytic activity:ATP + a [protein]-L-tyrosine = ADP + a [protein]-L-tyrosine phosphate. ,Function:Probable tyrosine protein-kinase , which has strong transforming capabilities on a variety of cell lines. When overexpressed , it can also induce tumor cell invasion as well as metastasis in distant organs. May act by activating both MAP kinase and phosphatidylinositol 3'-kinases (PI3K) pathways. ,similarity:Belongs to the protein kinase superfamily. Tyr protein kinase family. ,similarity:Contains 1 protein kinase domain. ,tissue specificity:Widely expressed. Highly expressed in brain , placenta and prostate. Expressed in tumor cells such as hepatoma cells LO2 , cervix carcinoma cells HeLa , ovary cancer cells Ho8910 and chronic myelogenous leukemia cells K562 , but not in other tumor cells such as epidermoid carcinoma (A431) . Undetectable in most normal lung tissues , widely expressed in lung cancers. ,
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