Enables identical protein binding activity. Involved in several processes, including negative regulation of reactive oxygen species metabolic process; regulation of aerobic respiration; and regulation of mitochondrion organization. Acts upstream of or within several processes, including brown fat cell differentiation; intrinsic apoptotic signaling pathway; and toxin transport. Located in mitochondrial membrane and postsynaptic density. Is expressed in several structures, including central nervous system; embryo mesenchyme; gut; musculoskeletal system; and nasal epithelium. Orthologous to human BNIP3 (BCL2 interacting protein 3). [provided by Alliance of Genome Resources, Apr 2022]