Cell Signaling Technology

Product Pathways - Jak/Stat Pathway

Jak3 (5H2) Mouse mAb #5481

Applications Reactivity Sensitivity MW (kDa) Isotype
W H Endogenous 115 Mouse IgG1

Applications Key:  W=Western Blotting
Reactivity Key:  H=Human
Species cross-reactivity is determined by western blot. Species enclosed in parentheses are predicted to react based on 100% sequence homology.

Protocols

Specificity / Sensitivity

Jak3 (5H2) Mouse mAb detects endogenous levels of human Jak3 protein.

Source / Purification

Monoclonal antibody was prepared from animals immunized with a purified recombinant fragment of human Jak3 expressed in E. Coli.

Western Blotting

Western Blotting

Western blot analysis of extracts from various cell lines using Jak3 (5H2) Mouse mAb.

Background

Members of the Janus family of tyrosine kinases (Jak1, Jak2, Jak3, and Tyk2) are activated by ligands binding to a number of associated cytokine receptors (1). Upon cytokine receptor activation, Jak proteins become autophosphorylated and phosphorylate their associated receptors to provide multiple binding sites for signaling proteins. These associated signaling proteins, such as Stats (2), Shc (3), insulin receptor substrates (4), and focal adhesion kinase (FAK) (5), typically contain SH2 or other phospho-tyrosine-binding domains.

Jak3 is primarily expressed in hematopoietic cells and is required for immune cell function and development (6-8). It binds to the common γ subunit (γc) and a shared receptor subunit also used by several cytokines including IL-2, IL-4, IL-7, IL-9, and IL-15 (9). IL-2 signaling and Stat5 activation is highly impaired by the loss of Jak3 (10,11). Jak3 is phosphorylated at multiple sites, including Tyr980 and 981 within its activation loop (12-14).

  1. Leonard, W.J. and O'Shea, J.J. (1998) Annu Rev Immunol 16, 293-322.
  2. Darnell, J.E. (1997) Science 277, 1630-5.
  3. VanderKuur, J. et al. (1995) J Biol Chem 270, 7587-93.
  4. Argetsinger, L.S. et al. (1995) J Biol Chem 270, 14685-92.
  5. Zhu, T. et al. (1998) J Biol Chem 273, 10682-9.
  6. Thomis, D.C. et al. (1995) Science 270, 794-7.
  7. Nosaka, T. et al. (1995) Science 270, 800-2.
  8. Park, S.Y. et al. (1995) Immunity 3, 771-82.
  9. Russell, S.M. et al. (1994) Science 266, 1042-5.
  10. Johnston, J.A. et al. (1994) Nature 370, 151-3.
  11. Oakes, S.A. et al. (1996) Immunity 5, 605-15.
  12. Zhou, Y.J. et al. (1997) Proc Natl Acad Sci U S A 94, 13850-5.
  13. Cheng, H. et al. (2008) Mol Cell Biol 28, 2271-82.
  14. Rikova, K. et al. (2007) Cell 131, 1190-203.

Application References

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For Research Use Only. Not For Use In Diagnostic Procedures.

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