Essential mediator of p53/TP53-dependent and p53/TP53- independent apoptosis. Interacts with MCL1 and BCL2A1. Interacts with BCL2 and BCL2L1/BCL-XL. By DNA damage, glucocorticoid treatment, growth factor deprivation and p53/TP53. Ubiquitously expressed. Belongs to the Bcl-2 family. 4 isoforms of the human protein are produced by alternative splicing. Note: This description may include information from UniProtKB.
Biological Process: apoptosis; caspase activation; determination of adult life span; DNA damage response, signal transduction by p53 class mediator resulting in induction of apoptosis; negative regulation of cell growth; negative regulation of growth; positive regulation of apoptosis; positive regulation of neuron apoptosis; positive regulation of protein homooligomerization; reduction of endoplasmic reticulum calcium ion concentration; release of cytochrome c from mitochondria; release of sequestered calcium ion into cytosol; response to DNA damage stimulus