Phospho-Gab2 (Tyr452) Antibody

3881:

Western Blotting

Phospho-Gab2 (Tyr452) Antibody detects endogenous levels of Gab2 only when phosphorylated at tyrosine 452. This antibody cross-reacts with phosphorylated Gab1 and Gab3.

Polyclonal antibodies are produced by immunizing animals with a synthetic phosphopeptide corresponding to residues surrounding Tyr452 of human Gab2. Antibodies are purified by protein A and peptide affinity chromatography.

Western Blotting

Western blot analysis of extracts from BaF3 cells, untreated or treated with Flt3 ligand, using Phospho-Gab2 (Tyr452) Antibody.

The Grb-associated binder (Gab) family is a family of adaptor proteins recruited by a wide variety of receptor tyrosine kinases (RTKs) such as EGFR, HGFR, insulin receptor, cytokine receptor and B cell antigen receptors. Upon stimulation of RTKs by their cognate ligand, Gab is recruited to the plasma membrane where it is phosphorylated and functions as a scaffold (1-4). Multiple tyrosine phosphorylation sites of Gab1 protein have been identified (5). Phosphorylation of Tyr472 regulates its binding to p85 PI3 kinase (6,7). Phosphorylation of Gab1 at Tyr307, Tyr373 and Tyr407 modulates its association to PLCγ (8). Phosphorylation of Tyr627 and Tyr659 is required for Gab1 binding to and activation of the protein tyrosine phosphatase SHP2 (6,9).

Gab2 is also phosphorylated by tyrosine kinases (10,11). Tyr452 is a potential binding site of p85, the regulatory subunit of PI3 kinase. Tyr614 is essential for SHP2 association (11). Furthermore, Akt phosphorylates Gab2 at Ser159 and inhibits Gab2 tyrosine phosphorylation, suggesting that Akt is engaged in negative feedback regulation of Gab2 signaling (12).

1. Holgado-Madruga, M. et al. (1996) Nature 379, 560-564.
2. Weidner, K.M. et al. (1996) Nature 384, 173-176.
3. Takahashi-Tezuka, M. et al. (1998) Mol. Cell. Biol. 18, 4109-4117.
4. Ingham, R.J. et al. (2001) J. Biol. Chem. 276, 12257-12265.
5. Lehr, S. et al. (1999) Biochemistry 38, 151-159.
6. Rocchi, S. et al. (1998) Mol. Endocrinol. 12, 914-923.
7. Yu, C.F. et al. (2001) J. Biol. Chem. 276, 32552-32558.
8. Gual, P. et al. (2000) Oncogene 19, 1509-1518.
9. Cunnick, J.M. et al. (2001) J. Biol. Chem. 276, 24380-24387.
10. Gadina, M. et al. (2000) J. Biol. Chem. 275, 26959-26966.
11. Yamasaki, S. et al. (2001) J. Biol. Chem. 276, 45175-45183.
12. Lynch, D.K. and Daly, R.J. (2002) EMBO J. 21, 72-82.

• Roumiantsev, S. et al. (2004) Distinct stem cell myeloproliferative/T lymphoma syndromes induced by ZNF198-FGFR1 and BCR-FGFR1 fusion genes from 8p11 translocations. Cancer Cell 5, 287-298. Applications: Western Blotting

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• 3239 Gab2 (26B6) Rabbit mAb
• 3882 Phospho-Gab2 (Tyr452) (C33G1) Rabbit mAb
• 3884 Phospho-Gab2 (Ser159) Antibody
• 3232 Gab1 Antibody
• 3231 Phospho-Gab1 (Tyr627) Antibody
• 3234 Phospho-Gab1 (Tyr307) Antibody
• 7074 Anti-rabbit IgG, HRP-linked Antibody
• 7720 Prestained Protein Marker, Broad Range (Premixed Format)
• 7727 Biotinylated Protein Ladder Detection Pack
• 7003 20X LumiGLO^® Reagent and 20X Peroxide
• 3233 Phospho-Gab1 (Tyr627) (C32H2) Rabbit mAb

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