Cell localization:Cytoplasm . Nucleus . Interaction with PIK3R2 is required for nuclear localization and export..This gene encodes an isoform of the catalytic subunit of phosphoinositide 3-kinase (PI3K). These kinases are important in signaling pathways involving receptors on the outer membrane of eukaryotic cells and are named for their catalytic subunit. The encoded protein is the catalytic subunit for PI3Kbeta (PI3KB). PI3KB has been shown to be part of the activation pathway in neutrophils which have bound immune complexes at sites of injury or infection. Alternative splicing resµLts in mµLtiple transcript variants. [provided by RefSeq, Dec 2011],
