Enables cysteine-type endopeptidase activity. Predicted to be involved in several processes, including learning or memory; positive regulation of chemotaxis; and proteolysis. Predicted to act upstream of or within negative regulation of neuron apoptotic process; regulation of growth; and response to acidic pH. Located in lysosome. Orthologous to human LGMN (legumain). [provided by Alliance of Genome Resources, Apr 2022]