Class II phosphoinositide 3-kinase (Class II PI3K)

Class II phosphoinositide 3-kinases (PI3K) are a distinct group of lipid kinases, including the isoforms PI3K-C2α, PI3K-C2β, and PI3K-C2γ, which regulate essential cellular processes through the production of 3-phosphoinositides [PMID: 30635424]. Unlike the well-studied Class I PI3Ks that respond to growth factors at the plasma membrane, Class II enzymes are primarily localized to endosomes, the Golgi apparatus, and the primary cilium, where they facilitate membrane trafficking and endocytosis [PMID: 23435371]. They play pivotal roles in vascular development, insulin signaling, and the maintenance of cellular architecture [PMID: 24463518, 22119522]. In disease contexts, Class II PI3Ks are implicated in metabolic disorders like type 2 diabetes, various cancers, and thrombotic conditions [PMID: 28251651, 31216453]. While most current PI3K inhibitors target Class I isoforms, Class II PI3Ks are gaining attention as potential therapeutic targets for more selective interventions in cardiovascular and metabolic medicine [PMID: 29309024].

Other names

PI3K-C2PIK3C2Phosphatidylinositol 3-kinase class IIPI3K Class 2

Inhibition of the catalytic activity of Class II PI3K isoforms, preventing the conversion of phosphatidylinositol (PI) to PI(3)P and PI(4)P to PI(3,4)P2, thereby disrupting downstream signaling and membrane trafficking pathways [PMID: 30635424].