Enables BH domain binding activity. Predicted to be involved in apoptotic mitochondrial changes; male gonad development; and positive regulation of cellular component organization. Predicted to act upstream of or within spermatogenesis. Predicted to be located in mitochondrial envelope. Human ortholog(s) of this gene implicated in ataxia telangiectasia; breast cancer; colon cancer; and prostate cancer. Orthologous to human BIK (BCL2 interacting killer). [provided by Alliance of Genome Resources, Apr 2022]