Identification of a Saccharomyces Cerevisiae Glucosidase That Hydrolyzes Flavonoid Glucosides
Overview
Microbiology
Affiliations
Baker's yeast (Saccharomyces cerevisiae) whole-cell bioconversions of naringenin 7-O-β-glucoside revealed considerable β-glucosidase activity, which impairs any strategy to generate or modify flavonoid glucosides in yeast transformants. Up to 10 putative glycoside hydrolases annotated in the S. cerevisiae genome database were overexpressed with His tags in yeast cells. Examination of these recombinant, partially purified polypeptides for hydrolytic activity with synthetic chromogenic α- or β-glucosides identified three efficient β-glucosidases (EXG1, SPR1, and YIR007W), which were further assayed with natural flavonoid β-glucoside substrates and product verification by thin-layer chromatography (TLC) or high-performance liquid chromatography (HPLC). Preferential hydrolysis of 7- or 4'-O-glucosides of isoflavones, flavonols, flavones, and flavanones was observed in vitro with all three glucosidases, while anthocyanins were also accepted as substrates. The glucosidase activities of EXG1 and SPR1 were completely abolished by Val168Tyr mutation, which confirmed the relevance of this residue, as reported for other glucosidases. Most importantly, biotransformation experiments with knockout yeast strains revealed that only EXG1 knockout strains lost the capability to hydrolyze flavonoid glucosides.
Advances in Engineering Nucleotide Sugar Metabolism for Natural Product Glycosylation in .
Crowe S, Liu Y, Zhao X, Scheller H, Keasling J ACS Synth Biol. 2024; 13(6):1589-1599.
PMID: 38820348 PMC: 11197093. DOI: 10.1021/acssynbio.3c00737.
Unlocking Flavor Potential Using Microbial β-Glucosidases in Food Processing.
Muradova M, Proskura A, Canon F, Aleksandrova I, Schwartz M, Heydel J Foods. 2023; 12(24).
PMID: 38137288 PMC: 10742834. DOI: 10.3390/foods12244484.
Flavonoids as Aglycones in Retaining Glycosidase-Catalyzed Reactions: Prospects for Green Chemistry.
Kotik M, Kulik N, Valentova K J Agric Food Chem. 2023; 71(41):14890-14910.
PMID: 37800688 PMC: 10591481. DOI: 10.1021/acs.jafc.3c04389.
Effects of Purified β-Glucosidases from , , on the Flavor Complexity and Typicality of Wines.
Zhu W, Zhang W, Qin T, Liao J, Zhang X J Fungi (Basel). 2022; 8(10).
PMID: 36294622 PMC: 9604742. DOI: 10.3390/jof8101057.
Xu S, Li G, Zhou J, Chen G, Shao J Front Bioeng Biotechnol. 2022; 10:899182.
PMID: 36061422 PMC: 9437251. DOI: 10.3389/fbioe.2022.899182.