ANAEROBIC ENDOGENOUS METABOLISM IN STREPTOCOCCUS FAECALIS

Area of Science:

• Microbiology
• Bacteriology
• Cellular Metabolism

Background:

• Endogenous metabolism describes the breakdown of cellular components for energy and biosynthesis.
• Understanding these processes is crucial for comprehending bacterial survival and function under nutrient-limited conditions.

Purpose of the Study:

• To investigate the endogenous metabolic pathways of Streptococcus faecalis.
• To characterize the release of soluble products and changes in glycolytic activity during incubation.

Main Methods:

• Washed suspensions of Streptococcus faecalis were incubated anaerobically in phosphate buffer.
• Analysis of released soluble substances (amino acids, carbohydrates, nucleotides) and acid production.
• Measurement of glycolytic activity over time and under various conditions.

Main Results:

• Amino acids were released into the medium, accounting for most soluble carbon production.
• Carbohydrate and acid production were minimal; cell lipid and nucleotides were stable.
• Glycolytic activity remained constant initially, then declined, influenced by cell concentration and external factors.
• Aged cells could regain glycolytic activity with amino acids and an energy source, leading to protein synthesis.

Conclusions:

• Streptococcus faecalis primarily releases amino acids during endogenous metabolism.
• Glycolytic activity is sensitive to environmental conditions and can be restored by specific nutrient and energy supplementation.
• Endogenous metabolism involves internal resource utilization for essential cellular processes.