One step purification and characterization of the pyrrolidone carboxyl peptidase of Streptococcus pyogenes over-expressed in Escherichia coli

  • Awadé A
  • Gonzalès T
  • Cleuziat P
 et al. 
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Pyrrolidone carboxyl peptidase (EC (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.

Author-supplied keywords

  • Over-expression
  • Pcp protein
  • Peptidase
  • Purification
  • Streptococcus pyogenes

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  • A. Awadé

  • Th Gonzalès

  • Ph Cleuziat

  • J. Robert-Baudouy

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