Cell Signaling Technology

Product Pathways - PI3K / Akt Signaling

PI3 Kinase p55 (D2B3) Rabbit mAb #11889

p55PIK   Phosphatidylinositol 3-kinase 55 kDa regulatory subunit gamma   PI3K   PIK3R3   PtdIns  

No. Size Price
11889S 100 µl ( 10 western blots ) ¥3,250.00 现货查询 购买询价 防伪查询
11889 carrier free & custom formulation / quantityemail request
Applications Dilution Species-Reactivity Sensitivity MW (kDa) Isotype
W 1:1000 Human,Mouse, Endogenous 55 Rabbit IgG
IP 1:50

Species cross-reactivity is determined by western blot.

Applications Key: W=Western Blotting, IP=Immunoprecipitation,

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.

PI3 Kinase p55 (D2B3) Rabbit mAb 兔单抗可以识别内源性的总PI3 kinase p55(PIK3R3)蛋白。抗体与PI3 kinase p85α (PIK3R1) 或PI3K kinase p85β (PIK3R2)没有交叉反应。

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).

使用PI3K激酶p55(D2B3)Rabbit mAb兔单抗(上)或β-Actin (D6A8)Rabbit mAb兔单抗#8457(下)对MDA-MB-453, Hs578T,和ZR-75-1细胞提取物进行western blot分析。


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).

PI3K激酶通过磷酸化磷脂酰肌醇(PI), 4-磷酸磷脂酰肌醇 (PIP)和4,5-二磷酸磷脂酰肌醇 (PIP2)催化3,4,5-三磷酸磷脂酰肌醇的产生。生长因子和激素会引发该磷酸化进程,随后协助细胞生长,细胞周期进入,细胞迁移和细胞存活(1)。PTEN会逆转该过程,研究表明PI3K信号通路在PTEN功能缺失的人类癌症中是持续性激活的(2)。PI3Ks由一个催化亚基(p110)和一个调控亚基构成。已经分离得到了多个催化亚基(p110α, p110β, p110γ, 和p110δ),与p110α, p110β, 和 p110δ结合的调控亚基是p85α 和 p85β (3).相对的,与p101调控亚基结合的p110γ与p85无关。此外,异源三聚体G蛋白的βγ亚基可以激活p110γ(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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For Research Use Only. Not For Use In Diagnostic Procedures.

Cell Signaling Technology is a trademark of Cell Signaling Technology, Inc.

Cell Signaling Technology® is a trademark of Cell Signaling Technology, Inc.

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