The function of DPEP1 (dipeptidase 1, ENSG00000015413) is as follows. Hydrolyzes a wide range of dipeptides including the conversion of leukotriene D4 to leukotriene E4 (PubMed:2303490, PubMed:31442408, PubMed:32325220, PubMed:6334084). Hydrolyzes cystinyl- bis-glycine (cys-bis-gly) formed during glutathione degradation (PubMed:32325220). Also possesses beta lactamase activity and can hydrolyze the beta-lactam antibiotic imipenem (PubMed:32325220, PubMed:6334084). {ECO:0000250|UniProtKB:P31428, ECO:0000269|PubMed:2303490, ECO:0000269|PubMed:31442408, ECO:0000269|PubMed:32325220, ECO:0000269|PubMed:6334084}. Independently of its dipeptidase activity, acts as an adhesion receptor for neutrophil recruitment from bloodstream into inflamed lungs and liver. .