Abstract
A previous study revealed that Saccharomyces cerevisiae mcd4Δ, a cell wall mutant with a defect in the synthesis of the glycosylphosphatidylinositol anchor, has a strong macrophage activation ability. In this study, remarkable emulsion formation after cell suspensions of mcd4Δ and anp1Δ (which exhibit an extreme reduction of mannan) were mixed with oil was found. Moreover, the relationship between cell wall mutation and emulsion formation was investigated, suggesting that och1Δ with a defect in the formation of N-linked glycans also had a strong emulsification ability and that high molecular weight materials released from the cells were involved in emulsion formation. Furthermore, two strains (asc1Δ and scp160Δ) with a strong emulsification ability without a large decrease in mannan content were also found from the wide screening of strains that exhibit an emulsifying activity using more than 5000 gene-deficient strains. These results provide valuable information for the development of a yeast-derived emulsifier.
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