Abstract

Tyrosine kinases of the Csk family play an important role in cell growth regulation and normal cell differentiation. They are also involved in carcinogenesis as oncoproteins. The main function of these tyrosine kinases is phosphorylation of tyrosine kinases of the Src family at their C-terminal regions to negatively regulate their activity. Disturbance of csk expression increases the Src tyrosine kinase activity. The full-length coding sequence of the csk cDNA was cloned from human lymphocytes. The 1624-bp cDNA consists of 12 exons and encodes a protein that has conserved SH2 and SH3 domains and is similar to human Csk tyrosine kinase by 99%. The full-length cDNA can be used to analyze the csk structure in normal or illdefined human cells.

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