[Enhanced ε-poly-L-lysine production by improving cellular activity during fermentation]

Area of Science:

• Microbiology
• Biotechnology
• Biochemistry

Context:

• ε-poly-1-lysine (ε-PL) is a biodegradable polymer with diverse applications.
• Optimizing microbial fermentation processes is crucial for efficient ε-PL production.
• Streptomyces ahygroscopicus is a key microorganism for ε-PL biosynthesis.

Purpose:

• To investigate the correlation between cellular activity and ε-poly-1-lysine (ε-PL) production in Streptomyces ahygroscopicus.
• To identify optimal conditions for enhancing cellular activity during ε-PL fermentation.
• To improve the overall yield of ε-PL through metabolic activity modulation.

Summary:

• Cellular activity was monitored during flask fermentation of Streptomyces ahygroscopicus using microscopy and colorimetric methods.
• Yeast extract was added to enhance cellular activity during the ε-PL production phase.
• Peak cellular activity was observed during the growth and early production phases (0-30 h), with a decline after 48 h.
• The improved fermentation strategy resulted in a significant increase in ε-PL production, from 1.04 g/L to 2.24 g/L.

Impact:

• Demonstrates that up-regulating cellular activity during the production phase can significantly boost ε-PL biosynthesis.
• Provides a practical approach for enhancing microbial production of ε-PL.
• Highlights the importance of monitoring and controlling cellular metabolic states for optimizing biopolymer synthesis.