Predicted to enable cysteine-type peptidase activity. Predicted to be involved in proteolysis. Predicted to act upstream of or within apoptotic process; autophagy; and protein transport. Predicted to be located in mitochondrion and nucleoplasm. Is expressed in central nervous system and retina. Orthologous to human ATG4D (autophagy related 4D cysteine peptidase). [provided by Alliance of Genome Resources, Apr 2022]