Dipeptidase that hydrolyzes leukotriene D4 (LTD4) into leukotriene E4 (LTE4) (PubMed:32325220). Hydrolyzes cystinyl-bis-glycine (PubMed:32325220). ; Independently of its dipeptidase activity can also modulate macrophage inflammatory response by acting as a regulator of NF-kappaB inflammatory signaling pathway.