Ovaj gen kodira inhibitorni protein apoptoze, čija ekspresija sprječava apoptozu nakon lišavanja faktora rasta. ovaj protein potiskuje apoptozu izazvanu transkripcijskim faktorom E2F1, a također stupa u interakciju i negativno regulira acinus, jedarni faktor koji je uključen u apopto fragmentacijutskku DNK . Njegovo iscrpljivanje pojačava citotoksično djelovanje hemoterapijskih lijekova. Kristalna struktura API5 pokazala je funkciju interakcije protein-protein.[7]
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