Protein Expression Level Changes in Weissella koreensis during Garlic Media Fermentation

Area of Science:

• Microbiology
• Biochemistry
• Food Science

Background:

• Weissella koreensis (WK) is a lactic acid bacterium (LAB) found in kimchi.
• Understanding WK's response to supplements like garlic is crucial for optimizing fermented foods.

Purpose of the Study:

• To investigate the impact of garlic supplementation on WK growth and protein expression during fermentation.
• To analyze changes in carbon source utilization and key protein levels.

Main Methods:

• Fermentation of WK in MRS medium with and without garlic (MBCG vs. MB).
• Measurement of cell counts, carbon sources (glucose, sucrose), and organic acids (lactic, acetic).
• Two-dimensional electrophoresis (2DE) and qRT-PCR to analyze protein expression changes.

Main Results:

• Garlic supplementation (MBCG) resulted in higher WK cell counts (3.55 × 10^10 CFU/mL) compared to control (MB) (2.55 × 10^10 CFU/mL).
• No significant differences were observed in glucose, sucrose, lactic acid, or acetic acid consumption/production between MB and MBCG.
• Protein analysis revealed decreased expression of fusA and ssb1, and increased expression of clpP in WK grown with garlic.

Conclusions:

• Garlic supplementation influences WK protein expression, specifically upregulating clpP and downregulating fusA and ssb1.
• These findings provide foundational data for exploring WK's biosynthetic pathways and optimizing its use in fermented products.