Abstract
Aerobic enrichment cultures with taurocholate or alkanesulfonates as sole sources of carbon and energy for growth were successful and yielded nine bacterial isolates, all of which utilized taurocholate. Growth was complex and involved not only many, usually transient, excretion products but also sorption of taurocholate and cholate to cells. Three metabolic strategies to dissimilate taurocholate were elucidated, all of which involved bile salt hydrolase cleaving taurocholate to cholate and taurine. Comamonas testosteroni KF-1 utilized both the taurine and the cholate moieties for growth. Pseudomonas spp., e.g. strain TAC-K3 and Rhodococcus equi TAC-A1 grew with the cholate moiety and released taurine quantitatively. Delftia acidovorans SPH-1 utilized the taurine moiety and released cholate.
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Acknowledgments
We are grateful to A. Haas (University of Bonn), who kindly made available PCR-primers for the vapA gene, plasmid DNA with the vapA gene, and for advice on R. equi. We thank K. Hollemeyer (University of the Saarland) for MALDI-TOF-MS analysis of taurocholate. Janosch Klebensberger (University of Konstanz) kindly discussed the effects of biofilm formation on growth kinetics. The US DOE Joint Genome Institute sequenced the genomes of C. testosteroni KF-1 and D. acidovorans SPH-1 for S. Kjelleberg and DS in its programme “DOE 2006 Microbes”. The project in Konstanz was supported by funds from the University of Konstanz.
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Communicated by Walter Reinecke.
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Rösch, V., Denger, K., Schleheck, D. et al. Different bacterial strategies to degrade taurocholate. Arch Microbiol 190, 11–18 (2008). https://doi.org/10.1007/s00203-008-0357-7
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DOI: https://doi.org/10.1007/s00203-008-0357-7