Cell Signaling Technology

Product Pathways - PI3K / Akt Signaling

PI3 Kinase p55 (D2B3) Rabbit mAb #11889

Applications Reactivity Sensitivity MW (kDa) Isotype
W IP H M Endogenous 55 Rabbit IgG

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

Protocols

Specificity / Sensitivity

PI3 Kinase p55 (D2B3) Rabbit mAb recognizes endogenous levels of total PI3 kinase p55 (PIK3R3) protein. This antibody does not cross-react with PI3 kinase p85α (PIK3R1) or PI3 kinase p85β (PIK3R2) proteins.

Source / Purification

Monoclonal antibody is produced by immunizing animals with a synthetic peptide corresponding to residues near the amino terminus of human PI3 kinase p55 protein.

Western Blotting

Western Blotting

Western blot analysis of extracts from MDA-MB-453, Hs578T, and ZR-75-1 cells using PI3 Kinase p55 (D2B3) Rabbit mAb (upper) or β-Actin (D6A8) Rabbit mAb #8457 (lower).

Background

Phosphoinositide 3-kinase (PI3K) catalyzes the production of phosphatidylinositol-3,4,5-triphosphate by phosphorylating phosphatidylinositol (PI), phosphatidylinositol-4-phosphate (PIP), and phosphatidylinositol-4,5-bisphosphate (PIP2). Growth factors and hormones trigger this phosphorylation event, which in turn coordinates cell growth, cell cycle entry, cell migration, and cell survival (1). PTEN reverses this process, and research studies have shown that the PI3K signaling pathway is constitutively activated in human cancers that have loss of function of PTEN (2). PI3Ks are composed of a catalytic subunit (p110) and a regulatory subunit. Various isoforms of the catalytic subunit (p110α, p110β, p110γ, and p110δ) have been isolated, and the regulatory subunits that associate with p110α, p110β, and p110δ are p85α and p85β (3). In contrast, p110γ associates with a p101 regulatory subunit that is unrelated to p85. Furthermore, p110γ is activated by βγ subunits of heterotrimeric G proteins (4).

  1. Cantley, L.C. (2002) Science 296, 1655-7.
  2. Simpson, L. and Parsons, R. (2001) Exp Cell Res 264, 29-41.
  3. Neri, L.M. et al. (2002) Biochim Biophys Acta 1584, 73-80.
  4. Stoyanov, B. et al. (1995) Science 269, 690-3.

Application References

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Companion Products

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

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