Pepstatin-insensitive acid proteases from Scytalidium lignicolum. Kinetic study with synthetic peptides.:Kinetic Study with Synthetic Peptides

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  • MORIHARA Kazuyuki
    Shionogi Research Laboratory, Shionogi & Co., Ltd.
  • TSUZUKI Hiroshige
    Shionogi Research Laboratory, Shionogi & Co., Ltd.
  • MURAO Sawao
    Laboratory of Applied Microbiology, College of Agriculture, University of Osaka Prefecture
  • ODA Kohei
    Laboratory of Applied Microbiology, College of Agriculture, University of Osaka Prefecture

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A kinetic study was conducted on the acid proteases A-I and A-2 from Scytalidium lignicolum using synthetic peptides as substrates. Almost maximum activity was attained with N-acylated tetrapeptides as the molecular size of substrates was increased. Suitable amino acid residues were required at the P1-P2 and P1'-P2' positions [notation of Schechter and Berger (14)]. Hydro-phobic or bulky residues such as leucine were specifically required at the Pl and P1' positions, with the specificity at the latter position being considerably lower than that at the former. For catalysis, the presence of certain amino acid residues at the P2 and P2' positions was essential, mainly in relation to kcat. An inhibition study supported this view. Stringent stereo-specificity was observed at the P2 and P2' positions, but the side chain specificity was low. Study of the B enzyme from the same organism was very difficult owing to its low activity against the peptides used. The Scytalidium acid proteases A-l, A-2, and B showed consider-ably different behavior against peptide substrates in comparison with usual acid proteases, which are sensitive to pepstatin.

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