Characterization of an Aspergillus oryzae Cysteinyl Dipeptidase Expressed in Escherichia coli

Abstract

Cysteinyl dipeptidase from Aspergillus oryzae (CdpA) was produced in Escherichia coli and purified. The enzyme showed activity specific toward cysteine-containing dipeptides, but its substrate specificity was distinct from those of other cysteinyl dipeptidases of the M20 family. It was optimally active at pH 7–8 and stable at pH 6–9 and at up to 40 °C.