Enables protein homodimerization activity; signaling receptor binding activity; and ubiquitin protein ligase binding activity. Involved in several processes, including activation of cysteine-type endopeptidase activity involved in apoptotic process by cytochrome c; ion homeostasis; and regulation of programmed cell death. Acts upstream of or within neuron apoptotic process. Located in several cellular components, including bounding membrane of organelle; mitochondrial membrane; and trans-Golgi network membrane. Is expressed in several structures, including central nervous system; embryo mesenchyme; gut; retina; and vibrissa dermal component. Orthologous to human BOK (BCL2 family apoptosis regulator BOK). [provided by Alliance of Genome Resources, Apr 2022]