Distribution of Free D-Amino Acids in Bivalve Mollusks and the Effects of Physiological Conditions on the Levels of D- and L-Alanine in the Tissues of the Hard Clam, <i>Meretrix lusoria</i>

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  • Okuma Emiko
    Department of Hematology, Research Institute, International Medical Center of Japan
  • Watanabe Katsuko
    Laboratory of Marine Biochemistry, Graduate School of Agricultural Life Science, The University of Tokyo
  • Abe Hiroki
    Laboratory of Marine Biochemistry, Graduate School of Agricultural Life Science, The University of Tokyo

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Other Title
  • Distribution of Free D-Amino Acids in Bivalve Mollusks and the Effects of Physiological Conditions on the Levels of D-and L-Alanine in the Tissues of the Hard Clam,Meretrix lusoria
  • Distribution of Free D Amino Acids in B
  • Distribution of free d-amino acids in bivalve mollusks and the effects of physiological conditions on the levels of d- and l-alanine in the tissues of hard clam Meretrix lusoria

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Abstract

The distribution of D-amino acids was examined on the tissues of seven species of marine bivalve mollusks belonging to two different subclasses, Pterimorphia and Heterodonta. High concentration of D-alanine was found in all tissues of only Heterodonta and not in the tissues of Pterimorphia except in gills and midgut gland. Several other D-amino acids including D-arginine also occurred in the several tissues of both groups of bivalves.<br> Along with the salinity stress on the hard clam Meretrix lusoria in 150% seawater, only D- and L-alanine increased in adductor muscle, gills, and midgut gland. The incorporation of D-alanine from external seawater was found only in gills, hemolymph, and midgut gland of hard clam, and the levels of D- and L-alanine in adductor and foot muscles decreased in the seawater containing 50mM D-alanine and returned to the control level after recovery in normal seawater.<br> During the starvation of hard clam for 22 days, D- and L-alanine as well as other free amino acids decreased considerably in most tissues. The anoxia of hard clam for a week duration gave no large effect on the levels of free amino acids but resulted in the slight increases of D- and L-alanine levels after seven days.

Journal

  • Fisheries science

    Fisheries science 64 (4), 606-611, 1998

    The Japanese Society of Fisheries Science

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