Recombinant Human XIAP-associated factor 1 (XAF1)

Uniprot Id

Q6GPH4

Target Species

Human

Target Name

XAF1

Target Full Name

XIAP-associated factor 1

Target Function

Seems to function as a negative regulator of members of the IAP (inhibitor of apoptosis protein) family. Inhibits anti-caspase activity of BIRC4. Induces cleavage and inactivation of BIRC4 independent of caspase activation. Mediates TNF-alpha-induced apoptosis and is involved in apoptosis in trophoblast cells. May inhibit BIRC4 indirectly by activating the mitochondrial apoptosis pathway. After translocation to mitochondria, promotes translocation of BAX to mitochondria and cytochrome c release from mitochondria. Seems to promote the redistribution of BIRC4 from the cytoplasm to the nucleus, probably independent of BIRC4 inactivation which seems to occur in the cytoplasm. The BIRC4-XAF1 complex mediates down-regulation of BIRC5/survivin; the process requires the E3 ligase activity of BIRC4. Seems to be involved in cellular sensitivity to the proapoptotic actions of TRAIL. May be a tumor suppressor by mediating apoptosis resistance of cancer cells.

Target Subcellular Location

Cytoplasm. Nucleus. Mitochondrion. Note=Found in the cytoplasm and nucleus of placental syncytiotrophoblasts. Translocates to mitochondria upon TNF-alpha treatment.; [Isoform 1]: Nucleus.; [Isoform 5]: Nucleus.

Target Tissue Specificity

Widely expressed. Expression is frequently down-regulated in cancer cell lines. Isoform 5 is widely expressed. Expressed in placenta (at protein level).

Target Synonyms

BIRC 4 binding protein; BIRC4 binding protein; BIRC4-binding protein; BIRC4BP; HSXIAPAF 1; HSXIAPAF1; XAF 1; XAF1; XAF1_HUMAN; XIAP associated factor 1; XIAP-associated factor 1; XIAPAF1