Pyrrolidone carboxyl peptidase (EC 126.96.36.199) (Pcp), an enzyme which selectively removes pyrrolidone carboxylic acid (PCA) from some PCA-peptides and -proteins, was demonstrated in bacteria and in plant, animal and human tissues. In this paper we describe the purification to homogeneity of the enzyme of Streptococcus pyogenes, over-expressed in Escherichia coli. This was achieved, for the first time in one step, by hydrophobic interaction chromatography. Analysis under non-denaturing conditions revealed a molecular mass of 85 kDa and in the presence of sodium dodecyl sulfate gave a molecular mass of 23.5 kDa. Investigations on enzymatic properties showed that the Pcp over-expressed in E. coli disclosed properties similar to those found for the enzyme extracted from S. pyogenes or for some other Pcps studied previously. Thus the over-expressed enzyme should serve as a suitable source for N-terminal unblocking prior to some PCA protein sequencing. © 1992.
Awadé, A., Gonzalès, T., Cleuziat, P., & Robert-Baudouy, J. (1992). One step purification and characterization of the pyrrolidone carboxyl peptidase of Streptococcus pyogenes over-expressed in Escherichia coli. FEBS Letters, 308(1), 70–74. https://doi.org/10.1016/0014-5793(92)81053-O