. "\"Catalysis of the removal of terminal peptide residues that are substituted, cyclized or linked by isopeptide bonds (peptide linkages other than those of alpha-carboxyl to alpha-amino groups).\" [EC:3.4.19.-]" . . "omega peptidase activity" . "EC:3.4.19" . . "peptidase activity, acting on peptides containing modified amino acids" .