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XAF1 Q6GPH4

XIAP相关因子1 (BIRC4结合蛋白)

蛋白质信息 (UniProt)

XIAP相关因子1 (BIRC4结合蛋白)

Q6GPH4

功能描述

似乎作为IAP(凋亡抑制蛋白)家族成员的负调控因子发挥作用。抑制BIRC4的抗caspase活性。诱导BIRC4的切割和失活,且不依赖于caspase激活。介导TNF诱导的细胞凋亡,并参与滋养层细胞的凋亡。可能通过激活线粒体凋亡途径间接抑制BIRC4。转位至线粒体后,促进BAX转位至线粒体以及细胞色素c从线粒体释放。似乎促进BIRC4从细胞质重分布至细胞核,这可能独立于似乎发生在细胞质中的BIRC4失活过程。BIRC4-XAF1复合物介导BIRC5/survivin的下调;该过程需要BIRC4的E3连接酶活性。似乎参与细胞对TRAIL促凋亡作用的敏感性。可能作为一种肿瘤抑制因子,通过介导癌细胞的凋亡抵抗发挥作用。 {ECO:0000269|PubMed:11175744, ECO:0000269|PubMed:12029096, ECO:0000269|PubMed:16432762, ECO:0000269|PubMed:17329253, ECO:0000269|PubMed:17613533}。

组织特异性

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

亚细胞定位

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

关键词

3D-structure Alternative splicing Apoptosis Cytoplasm Metal-binding Mitochondrion Nucleus Proteomics identification Reference proteome Tumor suppressor