该基因编码一种mg++独立酶，可水解磷脂酰肌醇3,4-二磷酸、肌醇1,3,4-三磷酸和肌醇3,4-二磷酸的肌醇环中的4-位磷酸盐。已经描述了编码不同亚型的多个转录变体。[由RefSeq提供，2008年8月]
This gene encodes an Mg++ independent enzyme that hydrolyzes the 4-position phosphate from the inositol ring of phosphatidylinositol 3,4-bisphosphate, inositol 1,3,4-trisphosphate, and inositol 3,4-bisphosphate. Multiple transcript variants encoding distinct isoforms have been described. [provided by RefSeq, Aug 2008]