Accumulation and Enrichment of Trace Elements by Yeast Cells and Their Applications: A Critical Review

Maintaining the homeostasis balance of trace elements is crucial for the health of organisms. Human health is threatened by diseases caused by a lack of trace elements. Saccharomyces cerevisiae has a wide and close relationship with human daily life and industrial applications. It can not only be used as fermentation products and single-cell proteins, but also as a trace elements supplement that is widely used in food, feed, and medicine. Trace-element-enriched yeast, viz., chromium-, iron-, zinc-, and selenium-enriched yeast, as an impactful microelements supplement, is more efficient, more environmentally friendly, and safer than its inorganic and organic counterparts. Over the last few decades, genetic engineering has been developing large-scaled genetic re-design and reconstruction in yeast. It is hoped that engineered yeast will include a higher concentration of trace elements. In this review, we compare the common supplement forms of several key trace elements. The mechanisms of detoxification and transport of trace elements in yeast are also reviewed thoroughly. Moreover, genes involved in the transport and detoxification of trace elements are summarized. A feasible way of metabolic engineering transformation of S. cerevisiae to produce trace-element-enriched yeast is examined. In addition, the economy, safety, and environmental protection of the engineered yeast are explored, and the future research direction of yeast enriched in trace elements is discussed.

Automated summary

Maintaining the balance of trace elements is crucial for organism health. Saccharomyces cerevisiae, as a widely used organism, can not only be used in various applications but also serve as a supplement for trace elements. Trace-element-enriched yeast, being more efficient, environmentally friendly, and safer than its counterparts, can provide a higher concentration of trace elements. Genetic engineering has the potential to further enhance the concentration of trace elements in yeast. This review explores different supplement forms of trace elements, mechanisms of detoxification and transport in yeast, as well as the feasibility, economy, safety, and future direction of trace-element-enriched yeast.