Anti-JAK3 Antibody Picoband® Fluoro488 Conjugated

Tyrosine-protein kinase JAK3 is an enzyme that in humans is encoded by the JAK3 gene. It is mapped to 19p13.11. The protein encoded by this gene is a member of the Janus kinase (JAK) family of tyrosine kinases involved in cytokine receptor-mediated intracellular signal transduction. It is predominantly expressed in immune cells and transduces a signal in response to its activation via tyrosine phosphorylation by interleukin receptors. Mutations in this gene are associated with autosomal SCID (severe combined immunodeficiency disease) .

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.

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.

1. Riedy MC, Dutra AS, Blake TB, Modi W, Lal BK, Davis J, Bosse A, O'Shea JJ, Johnston JA (October 1996) . Genomic sequence, organization, and chromosomal localization of human JAK3. Genomics. 37 (1) : 57–61. 2. Hoffman SM, Lai KS, Tomfohrde J, Bowcock A, Gordon LA, Mohrenweiser HW (July 1997) . JAK3 maps to human chromosome 19p12 within a cluster of proto-oncogenes and transcription factors. Genomics. 43 (1) : 109–11.