Phosphatidylinositol 3-kinase regulatory subunit alpha (UniProt: Q63787; also known as PI3-kinase regulatory subunit alpha, PI3K regulatory subunit alpha, PtdIns-3-kinase regulatory subunit alpha, Phosphatidylinositol 3-kinase 85 kDa regulatory subunit alpha, PI3-kinase subunit p85-alpha, PtdIns-3-kinase regulatory subunit p85-alpha) is encoded by the Pik3r1 gene (Gene ID: 25513) in rat. PI3K regulatory subunit alpha catalyzes the phosphorylation of PI(4,5)P2 inositol ring at the 3 position to generate PI(3,4,5)P3, a potent second messenger that mediates survival signaling and insulin action. PI3 Kinase is a heterodimeric complex composed of an 85 kDa regulatory subunit and a 110 kDa catalytic subunit. Following ligand binding to receptor and activation of receptor tyrosine kinase, the p85/p110 complex is recruited to the receptor by interaction of the SH2 domain of p85 with consensus phosphotyrosine residues on receptor tyrosine kinase.

• Reactivity: Rat (based on 1% sequence homology), mouse (based on 1% sequence homology), rhesus monkey (based on 1% sequence homology), bovine (based on 1% sequence homology), human

This allows the p110 catalytic subunit to come in close proximity to its lipid substrates in the cell membrane. The interaction of a receptor tyrosine kinase with the p85 subunit relieves the inhibitory effect of p85 on the p110 catalytic subunit. Activated PI 3-kinase phosphorylates phosphoinositol (PI) substrates to produce PI(3)P, PI(3,4)P2, and PI(3,4,5)P3 (PIP3). These molecules act as second messengers and recruit PI 3-kinase-dependent serine/threonine kinases (PDK1) and Akt from the cytoplasm to the plasma membrane. PI 3-kinase activity is tightly regulated in normal cells. Over-activation of this pathway can perturb the control mechanisms for cell growth and survival and contribute to metastatic competence and resistance to chemotherapy. Abnormal activation of PI 3-kinases is seen in several forms of cancer. About 30% of solid tumors contain mutations in the catalytic unit of their PI 3-kinase. PI3 kinase plays a critical role in insulin-stimulated increase in glucose uptake and glycogen synthesis in insulin-sensitive tissues. Mutations in Pik3r1 gene are known to be associated with insulin resistance.

Type: Primary
Antigen: PI3 Kinase
Clonality: Polyclonal
Clone:
Conjugation:
Epitope:
Host: Rabbit
Isotype:
Reactivity: Rat, Mouse, Rhesus monkey, Bovine, Human