Comprehensive metabolic profiling of Geotrichum candidum and comparison with Saccharomyces cerevisiae

Abstract

Geotrichum candidum is a dimorphic yeast used in cheese processing. To our knowledge, no major metabolites have been identified to date in G.candidum except for some amino acid and fatty acid metabolites. This has limited research on the commercial use of G.candidum. In this study, we aimed to analyze temporal changes in the intra- and extra-cellular metabolites of G.candidum and Saccharomyces cerevisiae cultured in YM medium as reference. As a result of metabolite analysis, it was observed that G. candidum tends to accumulate pentose phosphate pathway compounds, which are involved in nucleic acid synthesis, after 48 h of cultivation when compared to S. cerevisiae. In addition, G.candidum accumulated higher amounts of the antioxidant glutathione in the medium than did S.cerevisiae. In addition, G.candidum accumulated large amounts of B vitamins such as pantothenic acid and nicotinic acid in the medium. Finally, we examined the potential of G.candidum as a host for the production of useful compounds such as pantothenic acid. When cultured in medium supplemented with the pantothenic acid precursor β-alanine, G.candidum produced 12-fold higher amounts of pantothenic acid (30μM) than that by S.cerevisiae. This study indicates that G.candidum accumulates various useful compounds that are dissimilar to those produced by S.cerevisiae. Furthermore, G.candidum has the potential to produce useful chemicals under appropriate culture conditions.