mouse monoclonal IgG1; PI 3-kinase p85α Antibody (B-9) is an IgG1 κ mouse monoclonal PI 3-kinase p85 alpha antibody (also designated PI3K antibody, p85 alpha antibody, PIK3R1 antibody or phosphoinositide-3-kinase regulatory subunit 1 antibody) that detects the PI 3-kinase p85 alpha protein of mouse, rat and human origin by WB, IP, IF and IHC(P). PI 3-kinase p85α Antibody (B-9) is available as both the non-conjugated anti-PI 3-kinase p85 alpha antibody, and multiple Alexa Fluor® conjugates. Phosphatidylinositol 3-kinase (PI 3-kinase) is composed of p85 and p110 subunits. p85 lacks PI 3-kinase activity and acts as an adapter, coupling p110 to activated protein tyrosine kinase. Two forms of p85 have been described (p85α and p85β), each possessing one SH3 and two SH2 domains. Various p110 isoforms have been identified. p110α and p110β interact with p85α, and p110α has also been shown to interact with p85β in vitro. p110δ expression is restricted to white blood cells. It has been shown to bind p85α and β, but it apparently does not phosphorylate these subunits. p110δ seems to have the capacity to autophosphorylate. p110γ does not interact with the p85 subunits. It has been shown to be activated by α and βγ heterotrimeric G proteins.