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- W1966138874 abstract "Fungal infections of barley and wheat cause devastating losses of these food crops. The endogenous proteinase inhibitors produced by plant seeds probably defend the plants from pathogens by inhibiting the degradation of their proteins by the pathogen proteases. We have studied the interactions of barley grain inhibitors with the subtilisin-like and trypsinlike proteinases of Fusarium culmorum. The inhibition kinetics of three inhibitor proteins, chymotrypsin/subtilisin inhibitor 2 (CI-2), barley alpha-amylase/subtilisin inhibitor (BASI), and Bowman-Birk trypsin inhibitor (BBBI), have been studied in detail for the first time using fungal enzymes. The kinetic studies were performed at physiological pH values to mimic in vivo conditions. Numerical approaches to kinetic analyses were used to calculate the inhibition constants, because the data analyses were complicated by some inhibitor turnover and the instability of enzymes and substrates. All were slow, tight-binding inhibitors that followed either a two-step mechanism (CI-2 and BASI) or a single-step mechanism (BBBI) under the conditions investigated. The overall Ki values derived were approximately 50 pM, 1 nM, and 0.1 nM for CI-2, BASI, and BBBI, respectively. The main difference between the CI-2 and the BASI inhibitions was accounted for by the stabilities of their final complexes and the rate constants for their second dissociation steps (9 x 10(-6)/s and 3 x 10(-4)/s, respectively). Understanding the inhibition mechanisms will be valuable in designing improved strategies for increasing the resistance of the grains to fungal infections." @default.
- W1966138874 created "2016-06-24" @default.
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- W1966138874 date "2007-03-07" @default.
- W1966138874 modified "2023-09-26" @default.
- W1966138874 title "Kinetics of the Inhibition of <i>Fusarium</i> Serine Proteinases by Barley (<i>Hordeum vulgare</i> L.) Inhibitors" @default.
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- W1966138874 doi "https://doi.org/10.1021/jf0631777" @default.
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