1-phosphatidylinositol 4,5-bisphosphate phosphodiesterase beta-2 (PLC-β2)

Phospholipase C beta 2 (PLC-β2) is a key signaling enzyme primarily expressed in hematopoietic cells and taste receptor cells (UniProt P16885). It functions as a downstream effector for G protein-coupled receptors (GPCRs), where it is specifically activated by the Gβγ subunits of heterotrimeric G proteins (PubMed: 10409714). The enzyme catalyzes the hydrolysis of phosphatidylinositol 4,5-bisphosphate (PIP2) into two potent second messengers: inositol 1,4,5-trisphosphate (IP3) and diacylglycerol (DAG). These messengers trigger intracellular calcium release and activate protein kinase C, driving essential processes such as leukocyte chemotaxis and the sensory perception of bitter, sweet, and umami tastes (PubMed: 12594516). In clinical contexts, PLC-β2 is implicated in inflammatory disorders and the progression of certain malignancies, such as chronic myeloid leukemia, where its signaling is often dysregulated (PubMed: 25614330). While selective pharmacological inhibitors are currently limited to research tools like U73122, the protein remains a high-value target for modulating immune cell recruitment and inflammatory signaling (NCBI Gene: 5330).

Other names

Phospholipase C-beta-2PLCB2Phosphoinositide phospholipase C-beta-2PLC-beta-2

Inhibition of the enzymatic hydrolysis of phosphatidylinositol 4,5-bisphosphate (PIP2) to prevent the generation of second messengers IP3 and DAG.