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First published online July 23, 2003

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Stimulatory effect of sulphide on thiotaurine synthesis in three hydrothermal-vent species from the East Pacific Rise

Audrey M. Pruski^* and Aline Fiala-Médioni

Observatoire Océanologique de Banyuls, Laboratoire Arago, Université Pierre et Marie Curie, CNRS UMR 7621, BP 44, F-66651 Banyuls-sur-mer Cedex 01, France

View larger version (17K): [in a new window]   Fig. 1. Synthesis of thiotaurine in gill homogenates of (A) Calyptogena magnifica and (B) Bathymodiolus thermophilus, and (C) trophosome homogenates of Riftia pachyptila, incubated with various concentrations of sulphide (0.25, 0.5 and 1 mmol l-1 Na2S) and thiosulfate (1 mmol l-1 Na2S2O3). Values (µmol g-1 dry mass) are means ± S.D. (C. magnifica, N=6; B. thermophilus, N=5; R. pachyptila, N=4). Asterisks designate significant differences from the controls (Student's t-test, *P0.05, **P0.005).

View larger version (16K): [in a new window]   Fig. 2. The kinetics of thiotaurine production in gill homogenates of (A) Calyptogena magnifica and (B) Bathymodiolus thermophilus. Homogenates of C. magnifica and B. thermophilus were exposed, respectively, to 1 mmol l-1 and 0.25 mmol l-1 Na2S at time zero (filled symbols). Controls were obtained by incubating the homogenates with buffer (open symbols). Thiotaurine (triangles) and hypotaurine (circles) concentrations are given as µmol g-1 dry mass (means ± S.D.; C. magnifica, N=6; B. thermophilus, N=5).

View larger version (15K): [in a new window]   Fig. 3. The kinetics of thiotaurine production in trophosome homogenates of Riftia pachyptila exposed to Na2S (1 mmol l-1). Thiotaurine (filled triangles), hypotaurine (open circles) and taurine (filled squares) concentrations are given as µmol g-1 dry mass (means ± S.D., N=4).