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Uptake of amino acids by the mussel Modiolus demissus
Crowe, J.H.; Dickson, K.A.; Otto, J.L.; Colon, R.D.; Farley, K.K. (1977). Uptake of amino acids by the mussel Modiolus demissus. J. Exp. Zool. 202: 323-332
In: The Journal of Experimental Zoology. Wiley Interscience: New York, etc.. ISSN 0022-104X; e-ISSN 1097-010X
Peer reviewed article  
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  • Crowe, J.H.
  • Dickson, K.A.
  • Otto, J.L.
  • Colon, R.D.
  • Farley, K.K.
Abstract
    Unidirectional and net fluxes of amino acids into isolated gills and intact specimens of the mussel Modiolus demissus were studied. Influx follows Michaelis-Menten type kinetics, with Kt = 19 and 21 µM, and Vmax = 47 and 107 µmoles/g-hr for cycloleucine and glycine, respectively. The transport mechanism is specific for neutral amino acids, although other transport systems apparently exist for acidic and basic amino acids. Measurements of primary amines in interstitial waters from the sediments where the animals were found showed that variations in the concentration are found with depth in the sediment, with a maximal concentration of 110 µM. The major primary amines were identified as amino acids. Isolated gills were shown to deplete the medium of the naturally occurring primary amines.
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