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Bioadsorption of cadmium ion by cell surface-engineered yeasts displaying metallothionein and hexa-His

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Abstract

The Cd2+-chelating abilities of yeast metallothionein (YMT) and hexa-His displayed on the yeast-cell surface were compared. Display of YMT and hexa-His by α-agglutinin-based cell-surface engineering was confirmed by immunofluorescent labeling. Surface-engineered yeast cells with YMT and hexa-His fused in tandem showed superior cell-surface adsorption and recovery of Cd2+ under EDTA treatment on the cell surface than hexa-His-displaying cells. YMT was demonstrated to be more effective than hexa-His for the adsorption of Cd2+. Yeast cells displaying YMT and/or hexa-His exhibited a higher potential for the adsorption of Cd2+ than Escherichia coli cells displaying these molecules. In order to investigate the effect of the displayed YMT and hexa-His on sensitivity to toxic Cd2+, growth in Cd2+-containing liquid medium was monitored. Unlike hexa-His-displaying cells, cells displaying YMT and hexa-His fused in tandem induced resistance to Cd2+ through active and enhanced adsorption of toxic Cd2+. These results indicate that YMT-displaying yeast cells are a unique bioadsorbent with a functional chelating ability superior to that of E. coli.

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Acknowledgement

We thank Professor Tadashi Kokubo of Kyoto University for kindly allowing use of the inductively coupled plasma-atomic emission spectroscope.

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  1. Laboratory of Applied Biological Chemistry, Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Yoshida, Sakyo-ku, 606-8501, Kyoto, Japan

    K. Kuroda & M. Ueda

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  1. K. Kuroda
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  2. M. Ueda
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Correspondence to M. Ueda.

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Kuroda, K., Ueda, M. Bioadsorption of cadmium ion by cell surface-engineered yeasts displaying metallothionein and hexa-His. Appl Microbiol Biotechnol 63, 182–186 (2003). https://doi.org/10.1007/s00253-003-1399-z

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  • DOI: https://doi.org/10.1007/s00253-003-1399-z

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