Additivity-based design of the strongest possible turkey ovomucoid third domain inhibitors for porcine pancreatic elastase (PPE) and Streptomyces griseus protease B (SGPB)

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We describe here successful designs of strong inhibitors for porcine pancreatic elastase (PPE) and Streptomyces griseus protease B (SGPB). For each enzyme two inhibitor variants were designed. In one, the reactive site residue (position 18) was retained and the best residues were substituted at contact positions 13, 14, and 15. In the other variant the best residues were substituted at all contact positions except the reactive site where a Gly was substituted. The four designed variants were: for PPE, T13E14Y15-OMTKY3 and T13E14Y15G18M21P32V36-OMTKY3, and for SGPB, S13D14Y15-OMTKY3 and S13D14Y15G18I19K21-OMTKY3. The free energies of association (ΔG0) of expressed variants have been measured with the proteases for which they were designed as well as with five other serine proteases and the results are discussed.