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Optimization of conditions for cadmium selenide quantum dot biosynthesis in Saccharomyces cerevisiae

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Abstract

The biosynthesis of quantum dots has been explored as an alternative to traditional physicochemical methods; however, relatively few studies have determined optimal synthesis parameters. Saccharomyces cerevisiae sequentially treated with sodium selenite and cadmium chloride synthesized CdSe quantum dots in the cytoplasm. These nanoparticles displayed a prominent yellow fluorescence, with an emission maximum of approximately 540 nm. The requirement for glutathione in the biosynthetic mechanism was explored by depleting its intracellular content through cellular treatments with 1-chloro-2,4-dinitrobenzene and buthionine sulfoximine. Synthesis was significantly inhibited by both of these reagents when they were applied after selenite treatment prior to the addition of cadmium, thereby indicating that glutathione contributes to the biosynthetic process. Determining the optimum conditions for biosynthesis revealed that quantum dots were produced most efficiently at entry into stationary phase followed by direct addition of 1 mM selenite for only 6 h and then immediately incubating these cells in fresh growth medium containing 3 mM Cd (II). Synthesis of quantum dots reached a maximum at 84 h of reaction time. Biosynthesis of 800-μg g−1 fresh weight cells was achieved. For the first time, significant efforts have been undertaken to optimize each aspect of the CdSe biosynthetic procedure in S. cerevisiae, resulting in a 70% increased production.

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Acknowledgements

This work was supported by the Natural Sciences and Engineering Research Council of Canada (Grant No. 3740-08) and the Advisory Research Committee of Queen’s University, Canada.

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  1. Department of Biology, Queen’s University, Kingston, ON, K7L 3N6, Canada

    Jordan Brooks & Daniel D. Lefebvre

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  1. Jordan Brooks
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Correspondence to Daniel D. Lefebvre.

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Brooks, J., Lefebvre, D.D. Optimization of conditions for cadmium selenide quantum dot biosynthesis in Saccharomyces cerevisiae . Appl Microbiol Biotechnol 101, 2735–2745 (2017). https://doi.org/10.1007/s00253-016-8056-9

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