Anhydride Intermediates in Catalysis by Pepsin: Is Pepsin an Enzyme with Two Active Sites?

  • E. T. Kaiser
  • Y. Nakagawa
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 92)


Porcine pepsin is known to have two types of activities in acidic solution: the catalysis of peptide bond hydrolysis and the catalysis of transpeptidation (1). The presence of amino-enzyme intermediates in the catalytic action of pepsin has been proposed by Knowles (2–4) and Antonov et al. (5). On the other hand, Silver (6) and Hofmann (7) have proposed the existence of acyl-pepsin intermediates. Some mechanisms for pepsin action such as that suggested by Zeffren and Kaiser (8) involve the postulation of both acyl- and amino-enzyme intermediates. Recently, Fruton (9,10) has suggested that kinetically significant conformational changes of the pepsin active site in the presence of substrates or products instead of the formation of acyl-enzyme or amino-enzyme intermediates may account for the various data obtained for peptide hydrolysis and transpeptidation.


Circular Dichroism Spectrum Hydroxamic Acid Pepsin Activity Peptic Activity Porcine Pepsin 
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Copyright information

© Springer Science+Business Media New York 1977

Authors and Affiliations

  • E. T. Kaiser
    • 1
  • Y. Nakagawa
    • 1
  1. 1.Departments of Chemistry and BiochemistryUniversity of ChicagoChicagoUSA

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