Gene Information
Gene Symbol
AGM7, GRB1, IMD36, p85, p85-ALPHA
Entrez Gene ID
Gene Name
Phosphoinositide-3-kinase regulatory subunit 1
Chromosomal Location
Phosphatidylinositol 3-kinase phosphorylates the inositol ring of phosphatidylinositol at the 3-prime position. The enzyme comprises a 110 kD catalytic subunit and a regulatory subunit of either 85, 55, or 50 kD. This gene encodes the 85 kD regulatory subunit. Phosphatidylinositol 3-kinase plays an important role in the metabolic actions of insulin, and a mutation in this gene has been associated with insulin resistance. Alternative splicing of this gene results in four transcript variants encoding different isoforms. [provided by RefSeq, Jun 2011]
RefSeq DNA
RefSeq mRNA

Gene Ontology (GO)

GO ID Ontology Function Evidence Reference
GO:0008286 Biological process Insulin receptor signaling pathway IBA 21873635
GO:0014065 Biological process Phosphatidylinositol 3-kinase signaling IDA 7782332
GO:0014065 Biological process Phosphatidylinositol 3-kinase signaling IMP 21321938
GO:0033120 Biological process Positive regulation of RNA splicing IMP 20348923
GO:0034976 Biological process Response to endoplasmic reticulum stress IDA 20348923
Protein Information
Protein Name
Phosphatidylinositol 3-kinase regulatory subunit alpha, PI3-kinase subunit p85-alpha, PI3K regulatory subunit alpha, phosphatidylinositol 3-kinase 85 kDa regulatory subunit alpha, phosphatidylinositol 3-kinase, regulatory subunit, polypeptide 1 (p85 alpha), phosphatidylinositol 3-kinase-associated p-85 alpha, phosphoinositide-3-kinase regulatory subunit alpha, phosphoinositide-3-kinase, regulatory subunit 1 (alpha), ptdIns-3-kinase regulatory subunit alpha
Binds to activated (phosphorylated) protein-Tyr kinases, through its SH2 domain, and acts as an adapter, mediating the association of the p110 catalytic unit to the plasma membrane. Necessary for the insulin-stimulated increase in glucose uptake and glycogen synthesis in insulin-sensitive tissues. Plays an important role in signaling in response to FGFR1, FGFR2, FGFR3, FGFR4, KITLG/SCF, KIT, PDGFRA and PDGFRB. Likewise, plays a role in ITGB2 signaling (PubMed:17626883, PubMed:19805105, PubMed:7518429). Modulates the cellular response to ER stress by promoting nuclear translocation of XBP1 isoform 2 in a ER stress- and/or insulin-dependent manner during metabolic overloading in the liver and hence plays a role in glucose tolerance improvement (PubMed:20348923).
Refseq Proteins

EGFR tyrosine kinase inhibitor resistance
Endocrine resistance
Platinum drug resistance
ErbB signaling pathway
Ras signaling pathway
Rap1 signaling pathway
cAMP signaling pathway
Chemokine signaling pathway
HIF-1 signaling pathway
FoxO signaling pathway
Phosphatidylinositol signaling system
Sphingolipid signaling pathway
Phospholipase D signaling pathway
Autophagy - animal
mTOR signaling pathway
PI3K-Akt signaling pathway
AMPK signaling pathway
Longevity regulating pathway
Longevity regulating pathway - multiple species
Cellular senescence
Axon guidance
VEGF signaling pathway
Osteoclast differentiation
Focal adhesion
Signaling pathways regulating pluripotency of stem cells
Platelet activation
Toll-like receptor signaling pathway
C-type lectin receptor signaling pathway
JAK-STAT signaling pathway
Natural killer cell mediated cytotoxicity
T cell receptor signaling pathway
B cell receptor signaling pathway
Fc epsilon RI signaling pathway
Fc gamma R-mediated phagocytosis
TNF signaling pathway
Leukocyte transendothelial migration
Neurotrophin signaling pathway
Cholinergic synapse
Inflammatory mediator regulation of TRP channels
Regulation of actin cytoskeleton
Insulin signaling pathway
Progesterone-mediated oocyte maturation
Estrogen signaling pathway
Prolactin signaling pathway
Thyroid hormone signaling pathway
Regulation of lipolysis in adipocytes
Relaxin signaling pathway
Type II diabetes mellitus
Insulin resistance
Non-alcoholic fatty liver disease (NAFLD)
AGE-RAGE signaling pathway in diabetic complications
Aldosterone-regulated sodium reabsorption
Carbohydrate digestion and absorption
Bacterial invasion of epithelial cells
Yersinia infection
Chagas disease (American trypanosomiasis)
Hepatitis C
Hepatitis B
Human cytomegalovirus infection
Influenza A
Human papillomavirus infection
Human T-cell leukemia virus 1 infection
Kaposi sarcoma-associated herpesvirus infection
Herpes simplex virus 1 infection
Epstein-Barr virus infection
Human immunodeficiency virus 1 infection
Pathways in cancer
Viral carcinogenesis
Proteoglycans in cancer
Colorectal cancer
Renal cell carcinoma
Pancreatic cancer
Endometrial cancer
Prostate cancer
Chronic myeloid leukemia
Acute myeloid leukemia
Small cell lung cancer
Non-small cell lung cancer
Breast cancer
Hepatocellular carcinoma
Gastric cancer
Central carbon metabolism in cancer
Choline metabolism in cancer
PD-L1 expression and PD-1 checkpoint pathway in cancer
Fluid shear stress and atherosclerosis


PI3K Cascade
IRS-mediated signalling
GPVI-mediated activation cascade
Constitutive Signaling by Ligand-Responsive EGFR Cancer Variants
PI3K events in ERBB4 signaling
PIP3 activates AKT signaling
Interleukin-7 signaling
Signaling by SCF-KIT
Synthesis of PIPs at the plasma membrane
GAB1 signalosome
Signaling by cytosolic FGFR1 fusion mutants
Downstream signal transduction
PI3K events in ERBB2 signaling
PI3K/AKT activation
Downstream TCR signaling
Role of phospholipids in phagocytosis
Tie2 Signaling
Constitutive Signaling by Aberrant PI3K in Cancer
DAP12 signaling
Role of LAT2/NTAL/LAB on calcium mobilization
Costimulation by the CD28 family
CD28 dependent PI3K/Akt signaling
G alpha (q) signalling events
GP1b-IX-V activation signalling
Interleukin-3, Interleukin-5 and GM-CSF signaling
Constitutive Signaling by EGFRvIII
PI-3K cascade:FGFR1
PI-3K cascade:FGFR2
PI-3K cascade:FGFR3
PI-3K cascade:FGFR4
Signaling by FGFR2 in disease
Signaling by FGFR4 in disease
Signaling by FGFR1 in disease
Interleukin-4 and Interleukin-13 signaling
PI5P, PP2A and IER3 Regulate PI3K/AKT Signaling
MET activates PI3K/AKT signaling
Signaling by FGFR3 fusions in cancer
Signaling by FGFR3 point mutants in cancer
RET signaling
Extra-nuclear estrogen signaling
Erythropoietin activates Phosphoinositide-3-kinase (PI3K)
Interleukin receptor SHC signaling
Regulation of signaling by CBL
Signaling by ERBB2 KD Mutants
Signaling by ERBB2 ECD mutants
Signaling by PDGFRA transmembrane, juxtamembrane and kinase domain mutants
Signaling by PDGFRA extracellular domain mutants
Antigen activates B Cell Receptor (BCR) leading to generation of second messengers

ENSP00000282397 P17948 P17948
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Associated Diseases

Disease groupDisease NameReferences
Congenital, Hereditary, and Neonatal Diseases and Abnormalities
Genetic Diseases
Endocrine System Diseases
Immune System Diseases
Burkitt Lymphoma

[Detection and significance of phosphatidylinositol 3-kinase in adipose tissue of polycystic ovary syndrome patients with insulin resistance].

Chu Yong-li, Qiu Hong-yu, Sun Yong-yu, Li Min, Li Hong-fa
Department of Obstetrics and Gynecology, Xiehe Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China.
Zhonghua Fu Chan Ke Za Zhi. 2006 Jul;41(7):455-8.

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