該基因編碼一種屬于凋亡抑制蛋白家族的蛋白質。這個家族的成員有一個保守的基序，叫做桿狀病毒iap重復序列，這對他們的抗凋亡功能是必要的。該蛋白通過與腫瘤壞死因子受體相關因子traf1和traf2結合發揮作用，并抑制自由基誘導劑甲萘醌和白細胞介素1β轉化酶誘導的細胞凋亡。這種蛋白質還抑制至少兩種細胞死亡蛋白酶caspase家族成員caspase-3和caspase-7。該基因突變是x連鎖淋巴增生綜合征的病因。交替剪接導致多個轉錄變體。該基因的假基因存在于2號和11號染色體上。
This gene encodes a protein that belongs to a family of apoptotic suppressor proteins. Members of this family share a conserved motif termed, baculovirus IAP repeat, which is necessary for their anti-apoptotic function. This protein functions through binding to tumor necrosis factor receptor-associated factors TRAF1 and TRAF2 and inhibits apoptosis induced by menadione, a potent inducer of free radicals, and interleukin 1-beta converting enzyme. This protein also inhibits at least two members of the caspase family of cell-death proteases, caspase-3 and caspase-7. Mutations in this gene are the cause of X-linked lymphoproliferative syndrome. Alternate splicing results in multiple transcript variants. Pseudogenes of this gene are found on chromosomes 2 and 11.