Fig. 5

Peptide metabolism in L. lactis. a Level of PepX, PepA, PepN/C, Proline imino peptidase, endopeptidase and carboxypeptidase activity, expressed by L. lactis in log(RFU PPDA) where (1 RFU = the amount of μM of AMC released min^-1 by 1 mg of protein). Strains are clustered based on activity red-blue indicating increased activity. b Total peptidase activity expressed by lactococcal strains for PepX, PepA, proline imino peptidase, endopeptidase, carboxy-peptidase and PepN/C in RFU PPDA (1 RFU = the amount of μM of AMC released min^-1 by 1 mg of protein. c Hierarchical clustering analysis representing the presence/absence of gene families from COG group [E] amino acid transport and metabolism