Abstract
This work provides a comparative study of the inhibitory effect of several plant protein sources on digestive proteases of two snappers: yellow snapper (Lutjanus argentiventris) and dog snapper (Lutjanus novemfasciatus). Seed extracts did not affect gastric proteases whereas they significantly inhibit intestinal proteases. Inhibition of alkaline proteases showed that pancreatic proteases of L. argentiventris were more sensitive to seed protease inhibitors than those of L. novemfasciatus. Legume seeds showed the highest inhibitory capacity on alkaline proteases causing inhibition higher than 50% in total proteolytic activity. Protease inhibition on digestive extracts was assessed using different relative concentration of seed extracts and represented by constructing dose response curves. In order to reduce the inhibitory effect, seed extracts were acid-treated before the inhibition assay. Results showed that acid treatment did not affect the inhibitory capacity of seeds on alkaline proteases in both species. However, when the action of gastric enzymes was simulated on seed extracts, the inhibitory capacity was reduced significantly, mainly in the case of L. novemfasciatus. The responses of fish enzymes to heat-treated seed extracts were also tested. Only higher temperatures were capable of reducing the inhibitory capacity of seed, with the specific response to the snapper species. The use of biochemical assays allows us to quantify the action of inhibitors on total proteolytic activity. In addition, zymograms obtained by substrate-SDS-PAGE provided qualitative information about the number and type of proteases affected by each inhibitor. Each seed extract produces a characteristic profile of inhibition on alkaline protease. The results obtained are important for future formulation of feeds for these snapper species.
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Alarcón, F., García-Carreño, F. & Navarrete del Toro, M. Effect of plant protease inhibitors on digestive proteases in two fish species, Lutjanus argentiventris and L. novemfasciatus . Fish Physiology and Biochemistry 24, 179–189 (2001). https://doi.org/10.1023/A:1014079919461
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DOI: https://doi.org/10.1023/A:1014079919461
- digestive enzyme
- electrophoresis
- fish
- Lutjanus argentiventris
- L. novemfasciatus
- plant protein
- proteases
- protease inhibitor
- snapper