JAK3 Recombinant Rabbit Monoclonal Antibody [JM66-31]

Function

Tyrosine-protein kinase JAK3 is a tyrosine kinase enzyme that in humans is encoded by the JAK3 gene. As JAK3 is expressed in hematopoietic and epithelial cells, its role in cytokine signaling is thought to be more restricted than other JAKs. It is most commonly expressed in T cells and NK cells, but has also been found in intestinal epithelial cells. JAK3 is involved in signal transduction by receptors that employ the common gamma chain (γc) of the type I cytokine receptor family (e.g. IL-2R, IL-4R, IL-7R, IL-9R, IL-15R, and IL-21R). Mutations that abrogate Janus kinase 3 function cause an autosomal SCID (severe combined immunodeficiency disease), while activating Janus kinase 3 mutations lead to the development of leukemia. In addition to its well-known roles in T cells and NK cells, JAK3 has been found to mediate IL-8 stimulation in human neutrophils. IL-8 primarily functions to induce chemotaxis in neutrophils and lymphocytes, and JAK3 silencing severely inhibits IL-8-mediated chemotaxis.

Background References

1. Kaur M et al. Oxindole-based SYK and JAK3 dual inhibitors for rheumatoid arthritis: designing, synthesis and biological evaluation.Future Med Chem 9(11):1193-1211 (2017).

2. Shim YJ et al. Identification of Novel JAK3 Mutations by Whole-Exome Sequencing in a Korean Boy With Severe Combined Immunodeficiency.J Investig Allergol Clin Immunol 27(3):187-189 (2017).

Sequence Similarity

Belongs to the protein kinase superfamily. Tyr protein kinase family. JAK subfamily.

Tissue Specificity

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.

Post-translational Modification

Tyrosine phosphorylated in response to IL-2 and IL-4. Dephosphorylation of Tyr-980 and Tyr-981 by PTPN2 negatively regulates cytokine-mediated signaling (Probable).

Subcellular Location

Endomembrane system, Cytoplasm.

UNIPROT

SwissProt: P52333 Human

Synonyms