A Role of Tec: A non Receptor Tyrosine Kinase as Apoptotic Regulator
Enzyme in Programmed Cell Death
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Protein-tyrosine kinases (PTKs) play an essential role in the intracellular mitogenic signaling mechanism. In fact, many growth factor receptors themselves have intrinsic PTK activity, as evidenced by the cases of epidermal growth factor (EGF), nerve growth factor (NGF) and stem cell factor (SCF) receptors. In contrast to these receptor-type PTKs, many PTKs do not have a transmembrane domain in their structure. These are designated as non-receptor-type PTKs or cytoplasmic PTKs. Non-receptor PTKs can be further subdivided into a number of sub- families, one of which is the Tec family. The Tec f...
Protein-tyrosine kinases (PTKs) play an essential role in the intracellular mitogenic signaling mechanism. In fact, many growth factor receptors themselves have intrinsic PTK activity, as evidenced by the cases of epidermal growth factor (EGF), nerve growth factor (NGF) and stem cell factor (SCF) receptors. In contrast to these receptor-type PTKs, many PTKs do not have a transmembrane domain in their structure. These are designated as non-receptor-type PTKs or cytoplasmic PTKs. Non-receptor PTKs can be further subdivided into a number of sub- families, one of which is the Tec family. The Tec family consists of five members, namely Tec, Btk, Itk/Emt/Tsk, Bmx and Txk/Rlk. Many members of this family are abundantly expressed in hematopoietic tissues, where they are presumed to function in the growth, differentiation or both processes of blood cells. This hypothesis is strengthened by the fact that the Btk kinase molecule is responsible for X chromosome-linked agammaglobulinemia (XLA) in humans and X chromosome-linked immunodeficiency (Xid) in mice.
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