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  • Title: Replacement of P1 Leu18 by Glu18 in the reactive site of turkey ovomucoid third domain converts it into a strong inhibitor of Glu-specific Streptomyces griseus proteinase (GluSGP).
    Author: Komiyama T, Bigler TL, Yoshida N, Noda K, Laskowski M.
    Journal: J Biol Chem; 1991 Jun 15; 266(17):10727-30. PubMed ID: 1674942.
    Abstract:
    Turkey ovomucoid third domain with P1 Leu18 at its reactive site is an excellent inhibitor of chymotrypsin and elastase and of many other serine proteinases with related specificities. Semisynthetic replacement of P1 Leu18 by Lys18 causes the expected change into a trypsin inhibitor. Strikingly, semisynthetic replacement P1 Leu18 to Glu18 changes turkey ovomucoid third domain into a powerful inhibitor of Glu-specific Streptomyces griseus proteinase, GluSGP. Of the 131 natural avian ovomucoid third domains we have sequenced none have P1 Glu18, but several avian ovomucoid first domains have P1 Glu24. They are weak to moderate inhibitors of GluSGP.
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