|Calculated MW||125099 Da|
|Other Names||Tyrosine-protein kinase JAK3, Janus kinase 3, JAK-3, Leukocyte janus kinase, L-JAK, JAK3|
|Target/Specificity||A synthetic peptide corresponding to residues on the C-terminus of human JAK3 was used as an immunogen.|
|Format||50 mM Tris-Glycine (pH 7.4), 0.15 M NaCl, 40% Glycerol, 0.01% sodium azide and 0.05% BSA.|
|Storage||Maintain refrigerated at 2-8°C for up to 6 months. For long term storage store at -20°C in small aliquots to prevent freeze-thaw cycles.|
|Precautions||JAK3 Antibody (C-term) is for research use only and not for use in diagnostic or therapeutic procedures.|
|Function||Non-receptor tyrosine kinase involved in various processes such as cell growth, development, or differentiation. Mediates essential signaling events in both innate and adaptive immunity and plays a crucial role in hematopoiesis during T-cells development. In the cytoplasm, plays a pivotal role in signal transduction via its association with type I receptors sharing the common subunit gamma such as IL2R, IL4R, IL7R, IL9R, IL15R and IL21R. Following ligand binding to cell surface receptors, phosphorylates specific tyrosine residues on the cytoplasmic tails of the receptor, creating docking sites for STATs proteins. Subsequently, phosphorylates the STATs proteins once they are recruited to the receptor. Phosphorylated STATs then form homodimer or heterodimers and translocate to the nucleus to activate gene transcription. For example, upon IL2R activation by IL2, JAK1 and JAK3 molecules bind to IL2R beta (IL2RB) and gamma chain (IL2RG) subunits inducing the tyrosine phosphorylation of both receptor subunits on their cytoplasmic domain. Then, STAT5A AND STAT5B are recruited, phosphorylated and activated by JAK1 and JAK3. Once activated, dimerized STAT5 translocates to the nucleus and promotes the transcription of specific target genes in a cytokine-specific fashion.|
|Cellular Location||Endomembrane system; Peripheral membrane protein. Cytoplasm|
|Tissue Location||In NK cells and an NK-like cell line but not in resting T-cells or in other tissues. The S-form is more commonly seen in hematopoietic lines, whereas the B-form is detected in cells both of hematopoietic and epithelial origins|
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Provided below are standard protocols that you may find useful for product applications.
Jak3 is a member of the Janus family tyrosine kinases (Jaks), whose function is to transduce extracellular signals from cytokines and interferons. Jaks associate with cytokine receptors; upon ligand binding, Jaks phosphorylate the receptor. The phosphorylated receptors are bound by SH2-containing proteins, one class of which is the signal transducers and activators of transcription (STATs). Activated STATs translocate to the nucleus to mediate gene transcription (1, 2). Jak3 is activated after binding to the gamma chain of Interleukin receptors, specifically IL-2, IL-4, IL-7, IL-9, and IL-15 receptors. Jak3 has been implicated in mast cell-mediated immediate hypersensitivity reactions, autoimmune disorders, and acute lymphoblastic leukemia. Jak3 inhibitor has shown clinical potential as a new class of immunomodulatory agents with anti-leukemic and immunosuppressive properties (3).
1. Leonard WJ, et al., Annu Re. Immunol 16:293
2. O'Shea JJ, et al. J Clin Immunol 17:431
3. Cetkovi-Cvrlje M, et. al., Curr Phar Design 10:2767-1784, 2004.
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