Abstract
To increase the level of adsorption of heavy metal ions in surface-engineered yeasts, a yeast metallothionein (YMT) was tandemly fused and displayed by means of an α-agglutinin-based display system. The display of the YMT and its tandem repeats was examined by immunofluorescent labeling. The adsorption and recovery of Cd2+ on the cell surface was increasingly enhanced with increasing number of tandem repeats. All Cd2+-binding sites in the YMT tandem repeats were suggested to be completely occupied. To investigate the relationship between cell-surface adsorption and protection against heavy metal ion toxicity, the tolerance of these surface-engineered yeasts to Cd2+ was examined by growing in Cd2+-containing liquid medium. The rate of growth was found to be dependent on the number of displayed tandem repeats of YMT. These results suggest that the characteristics of surface-engineered yeasts as a bioadsorbent were dependent on the ability of the displayed proteins to bind metal ions, and the adsorption of heavy metal ions on the cell surface plays a major role in the ability of the cells to resist the toxic effects of metal ions.
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Acknowledgements
We thank Professor Tadashi Kokubo of Kyoto University for his permission to use the inductively coupled plasma-atomic emission spectroscope in his laboratory.
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Kuroda, K., Ueda, M. Effective display of metallothionein tandem repeats on the bioadsorption of cadmium ion. Appl Microbiol Biotechnol 70, 458–463 (2006). https://doi.org/10.1007/s00253-005-0093-8
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DOI: https://doi.org/10.1007/s00253-005-0093-8