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Acid and alkaline phosphatase activities in the clam Ruditapes philippinarum

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Abstract

Acid and alkaline phosphatase activities have been partially characterized in Ruditapes philippinarum (Adams and Reeve, 1850). Two activity peaks at pH=4.5 and pH 10.5 were detected in the gill, digestive gland, mantle, siphon and foot. Acid phosphatase activity was higher than that of alkaline phosphatase. The highest activity for both enzymes was observed in the digestive gland and, in decreasing order, the gill, foot, siphon and mantle. Alkaline phosphatase activity was similar in the mantle, siphon and foot. K m values were determined for both enzymes in the gill and digestive gland. Hill coefficients were near 1, indicating no allosteric behaviour for either enzyme in the two organs. The optimum temperature was the same for acid phosphatase in both gill and digestive gland (50 °C), while for alkaline phosphatase it differed for these two organs (gill, 40 °C; digestive gland, 35 °C). The apparent activation energy was obtained from Arrhenius plots, and ranged from 8.61 kcal/mol for alkaline phosphatase in the gill, to 10.84 kcal/mol for acid phosphatase in the digestive gland. The effects of metals (1 mM conc) on both enzyme activities were assayed in vitro. Hg strongly inhibited the enzyme activities in the gill and digestive gland, probably because of its affinity for the sulphydryl group. Histochemically, acid phosphatase in the gill was located in a granular form throughout the gill cells, but was undetectable in the ciliate epithelium of the gill filaments. Alkaline phosphatase was located in the gill skeleton. Clam size and phosphatase activities were inversely related, probably reflecting a decrease in shell deposition with inereasing size. As a function of season, both enzymes were present in lowest amounts in winter, when undifferentiated sex cells were predominant in the germinative epithelium, and highest in summer, when ripe individuals of both sexes were more frequent.

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Authors and Affiliations

  1. Polígono Río San Pedro s/n, Instituto de Ciencias Marinas de Andalucía (C.S.I.C.), Apartado Oficial, E-11510, Puerto Real, (Cádiz), Spain

    J. Blasco, J. Puppo & M. C. Sarasquete

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  1. J. Blasco
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  2. J. Puppo
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  3. M. C. Sarasquete
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Communicated by J. M. Pérès, Marseille

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Blasco, J., Puppo, J. & Sarasquete, M.C. Acid and alkaline phosphatase activities in the clam Ruditapes philippinarum . Marine Biology 115, 113–118 (1993). https://doi.org/10.1007/BF00349392

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  • DOI: https://doi.org/10.1007/BF00349392

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