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PepX aminopeptidase from Streptococcus thermophilus ACA DC 0022, used in Greek Feta cheese manufacturing, was purified. PepX comprises two subunits of equal molecular mass estimated, using SDS-PAGE and native-PAGE electrophoresis, to be 86 kDa.The effects of high pressure processing (100–450 MPa, combined with 20–40 °C) on purified PepX activity and structure were studied. Activation of the enzyme...