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Bioenergetic consequences of microbial adaptation to low-nutrient environments
M J Teixeira de Mattos1, O M Neijssel
1E.C. Slater Institute for Biochemistry and Microbiology, University of Amsterdam, The Netherlands.
Journal of Biotechnology
|March 6, 1998
Summary
Prokaryotes adapt to low nutrients by altering cellular structures and enzyme activity. This metabolic flexibility maintains nutrient uptake but reduces energy efficiency, lowering growth yield.
Area of Science:
- Microbiology
- Biochemistry
- Cellular Biology
Background:
- Prokaryotes exhibit remarkable metabolic flexibility in response to nutrient availability.
- Phenotypic adaptations to low-nutrient conditions include cellular changes and altered enzyme systems for nutrient uptake.
Purpose of the Study:
- To review the responses of Enterobacteriaceae to nutrient-limited conditions (potassium, ammonium, energy source).
- To focus on the energetic consequences of these adaptations, particularly on energy source growth yield (Y energy source).
Main Methods:
- Review of existing literature on prokaryotic responses to nutrient limitation.
- Analysis of how adaptations affect energy conservation and metabolic efficiency.
Main Results:
- Adaptations to low nutrient conditions can lead to significantly lowered Y energy source values.
- Mechanisms include incomplete substrate oxidation (overflow metabolism), uncoupling, and futile cycles.
Conclusions:
- Prokaryotic adaptation to low nutrient conditions prioritizes maintaining metabolic flux over energetic efficiency.
- This strategy allows survival in nutrient-scarce environments at the cost of reduced energy conservation.