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Intestinal phytase I: Detection and preliminary characterization of activity in the intestinal brush border membrane of hybrid striped bass Morone saxatilis × M. chrysops

Fish Physiology and Biochemistry volume 26, pages 249–258 (2002)Cite this article

Abstract

While numerous studies have evaluated intestinal phytase activity in terrestrial monogastric species, little work has been conducted investigating the enzyme's activity in finfish. This experiment was conducted to determine if hybrid striped bass Morone saxatilis × M. chrysops possess intestinal phytase activity, and to perform a preliminary characterization of this activity in terms of pH, metal ion dependence and substrate kinetics. Hybrid bass do exhibit low levels of intestinal phytase activity. The activity has an acidic pH optimum between 3.5 and 4.5. Low concentrations of Mn2+ slightly enhance this activity. The divalent cations Mg2+ and Zn2+ were shown to either have no effect on the enzyme activity or to be inhibitory, particularly at high concentrations. The present results indicate that intestinal phytase activity in hybrid bass does follow Michaelis-Menten kinetics, with estimated Km and Vmax values of 2.5 mM phytate and 4.8 units mg−1 protein, respectively. The physiologic significance of the enzyme's presence in hybrid striped bass is questionable due to the low activity as compared to terrestrial monogastrics, the acidic pH optimum and the low affinity the enzyme appears to have for phytate. These observations also raise the question of whether the intestinal phytase activity detected in hybrid bass is merely a manifestation of non-specific acid phosphatase activity. Further investigation is needed to determine the practical significance of phytase activity in hybrid bass in terms of phytate phosphorus utilization. Additional experiments should also be conducted which evaluate intestinal phytase activity in other important aquacultured finfish species.

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  1. Department of Animal and Avian Sciences, University of Maryland, College Park, MD, 20742-2311, USA

    L.E. Ellestad, R. Angel & J.H. Soares Jr.

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  1. L.E. Ellestad
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  2. R. Angel
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  3. J.H. Soares Jr.
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Ellestad, L., Angel, R. & Soares, J. Intestinal phytase I: Detection and preliminary characterization of activity in the intestinal brush border membrane of hybrid striped bass Morone saxatilis × M. chrysops . Fish Physiology and Biochemistry 26, 249–258 (2002). https://doi.org/10.1023/A:1026279507705

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  • DOI: https://doi.org/10.1023/A:1026279507705

  • enzyme activity
  • metal ion dependence
  • pH optima
  • phytate phosphorus
  • Michaelis-Menten kinetics

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