Penicillopepsin: 2.8 a Structure, Active Site Conformation and Mechanistic Implications

  • I-Nan Hsu
  • Louis T. J. Delbaere
  • Michael N. G. James
  • Theo Hofmann
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 92)


Penicillopepsin is an acid protease produced by the mold Penicillium janthinellum at pH’s less than 4.1 (1). Enzyme production occurs after the mycelial growth has ceased and sporulation has begun (2). The specificity and catalytic mechanism of penicillo-pepsin are very similar to those of porcine pepsin (3). The two active site aspartic acid residues, Asp-32 and Asp-215, occur in peptide sequences of at least eight amino acid residues which are almost identical in penicillopepsin, pepsin and chymosin (1,4–10). In addition, there is an overall 32% identity of amino acid sequence between penicillopepsin and porcine pepsin; a tentative sequence alignment of these two enzymes is given in Table I using this sequence numbering of porcine pepsin (5). These facts indicate that the fungal enzyme penicillopepsin is an evolutionary homologue of the mammalian acid proteases.


Peptide Bond Acid Protease Amide Nitrogen Porcine Pepsin Scissile Bond 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media New York 1977

Authors and Affiliations

  • I-Nan Hsu
    • 1
  • Louis T. J. Delbaere
    • 1
  • Michael N. G. James
    • 1
  • Theo Hofmann
    • 2
  1. 1.MRC Group on Protein Structure and FunctionUniversity of AlbertaEdmontonCanada
  2. 2.Department of BiochemistryUniversity of TorontoTorontoCanada

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