Histone deacetylases in sake yeast affect fermentation characteristics.

Area of Science:

• Enology
• Molecular Biology
• Biochemistry

Background:

• Yeast histone deacetylases (HDAC) play a role in regulating gene expression.
• HDACs are known to influence the production of various metabolites in yeast.
• Understanding HDAC function is crucial for optimizing fermentation processes in alcoholic beverages.

Purpose of the Study:

• To investigate the impact of HDAC gene disruption on sake fermentation characteristics.
• To identify specific HDAC genes that influence the production of flavor components in sake.
• To elucidate the role of HDAC complexes in regulating sake quality.

Main Methods:

• Utilized a gene-disrupted yeast strain (Kyokai No. 701) with specific HDAC genes (RPD3, HDA1, DEP1, SDS3) knocked out.
• Analyzed flavor components in sake produced by modified yeast strains using techniques like HPLC.
• Quantified levels of key aroma compounds such as isoamyl acetate and isoamyl alcohol.

Main Results:

• Disruption of RPD3 or HDA1 genes led to a twofold increase in isoamyl acetate production.
• The rpd3Δ strain showed increased levels of isoamyl alcohol.
• Disruption of DEP1 or SDS3 (components of Rpd3L complex) also increased isoamyl alcohol production, without affecting esterification efficiency.
• HDAC genes may influence isoamyl acetate production in response to oxygen levels.

Conclusions:

• HDAC genes significantly regulate the production of flavor components during sake fermentation.
• Targeting specific HDAC genes offers a potential strategy for manipulating sake flavor profiles.
• Further research into the regulatory mechanisms of HDACs in yeast fermentation is warranted.