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Sporulation in Bacillus subtilis. Biochemical changes
The Biochemical Journal
|October 1, 1968
Summary
Bacillus subtilis enzyme activity changes during growth and sporulation, with key enzymes like glucose dehydrogenase showing significant increases. These metabolic shifts correlate with spore formation and development.
Area of Science:
- Microbiology
- Biochemistry
- Molecular Biology
Background:
- Bacillus subtilis undergoes complex morphological and biochemical changes during sporulation.
- Understanding enzyme activity dynamics is crucial for elucidating the mechanisms of bacterial spore formation.
Purpose of the Study:
- To comprehensively measure and analyze the specific activities of intracellular enzymes during Bacillus subtilis growth and sporulation.
- To correlate enzymatic changes with key developmental events in spore formation.
Main Methods:
- Cultivation of Bacillus subtilis in chemically defined media.
- Measurement of 16 parameters, including specific activities of nine intracellular enzymes.
- Monitoring of morphological changes like refractility and heat resistance.
Main Results:
- Proteolytic activity peaked post-growth.
- Alkaline phosphatase increased fivefold with excess phosphate.
- Malate dehydrogenase remained stable; fumarase increased 2-3 fold post-growth.
- Aconitase activity increased significantly upon nutrient shifts or depletion.
- Alanine dehydrogenase, soluble NADH oxidase, and glucose dehydrogenase showed marked increases post-growth.
- Refractility, 2,6-dipicolinic acid synthesis, and heat resistance appeared sequentially post-growth.
Conclusions:
- Enzyme activity profiles provide insights into Bacillus subtilis sporulation.
- Specific enzyme increases are temporally linked to morphological and biochemical spore development events.
- Metabolic reprogramming is integral to successful spore formation in Bacillus subtilis.