PtdIns-(4,5)-P2-biotinamide (sodium salt)

PtdIns-(4,5)-P2-biotinamide (sodium salt) is a synthetic derivative of phosphatidylinositol-4,5-bisphosphate (PIP2) linked with biotin via an amide bond. This modification enables the molecule to act as a robust tool for biochemical and cell signaling research. PIP2 is a central lipid signaling molecule, serving as a substrate for phosphoinositide-specific phospholipase C (PLC) and a precursor to second messengers diacylglycerol (DAG) and inositol-1,4,5-trisphosphate (IP3). In addition, PIP2 directly influences membrane cytoskeletal dynamics and various protein-protein interactions via binding to pleckstrin homology (PH) domains and other lipid-binding domains. The biotinylated version, PtdIns-(4,5)-P2-biotinamide, facilitates the isolation, purification, and identification of PIP2-interacting proteins through affinity capture techniques such as streptavidin-biotin binding. This allows for the study of the PIP2 interactome, aiding researchers in pinpointing novel PIP2-binding proteins and unraveling their specific cellular functions. Additionally, the compound is invaluable in understanding the regulatory dynamics of phosphoinositide metabolism, signaling pathways like phosphoinositide 3-kinase (PI3K), and the activation of protein kinase C (PKC). It also helps map the spatial distribution of PIP2 in living cells, offering insights into phosphoinositide compartmentalization and the spatial organization of lipid-based signaling.