Regulates APAF1 expression and plays an important role in the regulation of stress-induced apoptosis. Promotes apoptosis by regulating three pathways, apoptosome up-regulation, LGALS3/galectin-3 down-regulation and NF-kappa-B inactivation. Regulates the redistribution of APAF1 into the nucleus after proapoptotic stress. Down-regulates the expression of LGALS3 by inhibiting NFKB1 (By similarity). Modulates isoactin dynamics to regulate the morphological alterations required for cell growth and motility. Interaction with ARF6 may modulate cell shape and motility after injury. May be involved in multiple neurite formation (By similarity). Component of the apoptosome complex, composed of APAF1, pro-caspase-9 and UACA. In the complex, it probably interacts directly with APAF1. Interacts with LGALS3, ARF6 and ACTB. Interacts with RAB39A (By similarity). Expressed diffusely in cytoplasm. Highly expressed in adrenal, testis, kidney and large intestine. Up-regulated in stimulated thyroids. Down-regulated by forskolin and TSH. Up-regulated by EGF.