該基因編碼磷酸肌醇3激酶（pi3k）催化亞單位的一個亞型。這些激酶在涉及真核細胞外膜受體的信號傳導途徑中起重要作用，并以其催化亞單位命名。編碼蛋白是pi3kba（pi3kb）的催化亞基。pi3kb是中性粒細胞活化途徑的一部分，中性粒細胞在損傷或感染部位與免疫復合物結合。選擇性剪接導致多個轉錄變體。[由RefSeq提供，2011年12月]
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 results in multiple transcript variants. [provided by RefSeq, Dec 2011]