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Antiapoptotic factor that may have a role in protein assembly. Negatively regulates ACIN1. By binding to ACIN1, it suppresses ACIN1 cleavage from CASP3 and ACIN1-mediated DNA fragmentation. Also known to efficiently suppress E2F1-induced apoptosis. Its depletion enhances the cytotoxic action of the chemotherapeutic drugs.
Gene References into Functions
study demonstrates that apoptosis inhibitor 5 is an endogenous and direct inhibitor of caspase-2. API5 protein directly binds to the caspase recruitment domain (CARD) of caspase-2 and impedes dimerization and activation of caspase-2. PMID: 28336776
Authors propose a proapoptotic role for NP in IAV pathogenesis, whereby it suppresses expression of antiapoptotic factor API5, thus potentiating the E2F1-dependent apoptotic pathway and ensuring viral replication. PMID: 26673663
Authors show that API5 increases the metastatic capacity of cervical cancer cells in vitro and in vivo via up-regulation of MMP-9. PMID: 25248562
rs17684886 (ZNRF1) and rs599019 (COLEC12) are associated with diabetic retinopathy and rs6427247 (SCYL1BP1) and rs899036 (API5) are associated with severe diabetic retinopathy in Chinese patients with type 2 diabetes PMID: 25819896
API5 overexpression promoted cell proliferation and colony formation in CaSki cancer cells, whereas API5 knockdown inhibited the both properties in HeLa cells; API5 expression is associated with pERK1/2 in a subset of cervical cancer patients and its expression predicts poor overall survival. PMID: 25070070
miR-143 and miR-145 and the predicted target proteins API5, ERK5, K-RAS, and IRS-1 display regional differences in expression in the colon PMID: 25477374
Negative regulation of API-5 expression by miR-1 was demonstrated to promote apoptosis of HepG2 cells. PMID: 25433291
API5 acts as an immune escape gene in tumors by rendering them resistant to apoptosis triggered by tumor antigen-specific T cells. PMID: 24769442
Low miR-224 and high API5 expression correlated with worse survival of glioblastoma patients. PMID: 24785373
Api5, even if not physically interacting with E2F1, contributes positively to E2F1 transcriptional activity by increasing E2F1 binding to its target promoters. PMID: 23940755
The prognostic significance of the genes casein kinase 2 alpha subunit (CSNK2A1), anti-apoptosis clone-11 (AAC-11), and tumor metastasis suppressor NME1 in completely resected non-small cell lung cancer (NSCLC) patients, was analysed. PMID: 20671611
we infer that Pim-2 could activate API-5 to inhibit the apoptosis of liver cells, and NF-kappaB is the key regulator PMID: 19821157
Apoptosis inhibitor-5/antiapoptosis clone-11 (Api5/Aac11) is a critical determinant of dE2F1-induced apoptosis in vivo and in vitro. PMID: 17112319
define a true in vivo target of miR-224 and reaffirm the important role of miRNAs in the dysregulation of cellular processes that may ultimately lead to tumorigenesis PMID: 18319255
The authors report here that AAC-11, a survival protein whose expression prevents apoptosis that occurs on deprivation of growth factors, physiologically binds to Acinus and prevents Acinus-mediated DNA fragmentation. PMID: 19387494
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Subcellular Location
Nucleus. Cytoplasm. Note=Mainly nuclear. Can also be cytoplasmic.; [Isoform 3]: Cytoplasm.
Protein Families
API5 family
Tissue Specificity
Expressed in all tissues tested, including heart, brain, placenta, lung, liver, skeletal muscle, kidney and pancreas. Highest levels in heart, pancreas and placenta. Highly expressed in several cancers. Preferentially expressed in squamous cell carcinoma