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Experiments supporting the possible role of the free sulfur-containing amino acid thiotaurine, as a transport and storage compound for sulfide in invertebrates with thiotrophic symbionts are described. The free-living chemotrophic sulfur-oxidising bacterium, Thiobacillus hydrothermalis (strain DSMZ 7121), was used as a model for the symbionts as the actual symbionts have not been obtained in culture...
Three sulphur-amino acids, taurine, hypotaurine and thiotaurine, are shown to exist in deep-sea symbiotic mussels. Their relative and absolute importance differs in the three species of mussels studied and seems to be related to the metabolism of the symbionts. Thiotaurine only occurs in high concentration in thiotrophic species, whereas hypotaurine and taurine are found in all the species studied...
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