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Lipid composition of Bacillus megaterium spores and spore membranes
1Department of Biological Chemistry, University of Illinois, Chicago 60612.
Abstract:
Bacillus megaterium QM B1551 spore lipids were extracted by an improved technique, and the phospholipid and fatty acid compositions were determined. Phospholipids accounted for 65% of the total fatty acids; the neutral lipid fraction contained 15% and the remaining fatty acids were in the interphase, aqueous phase and pellet from the lipid extraction. Each phospholipid had similar fatty acid compositions as did the delipidated pellet. However, the aqueous phase and, to some extent, the interphase had unique fatty acid compositions. Also, fatty acids were found acylated to proteins, which was observed by electrophoresis of delipidated proteins from spores grown in [1-14C]palmitate. Therefore, spores contain unique non-phosphatide fatty acid components that can now be analyzed.
Insights
Bacillus megaterium spore lipids were analyzed using an improved extraction technique. Unique non-phospholipid fatty acids were discovered, acylated to proteins within the spores.
Area of Science:
- Microbiology
- Biochemistry
Background:
- Bacillus megaterium spores are known for their resilience.
- Understanding spore lipid composition is crucial for various applications.
Purpose of the Study:
- To analyze the lipid and fatty acid composition of Bacillus megaterium QM B1551 spores.
- To identify novel lipid components and their locations within the spore.
Main Methods:
- Improved lipid extraction technique applied to Bacillus megaterium spores.
- Phospholipid and fatty acid composition analysis.
- Electrophoresis used to detect fatty acids acylated to proteins.
Main Results:
- Phospholipids constituted 65% of total fatty acids; neutral lipids accounted for 15%.
- Unique fatty acid compositions were found in the aqueous phase and interphase.
- Fatty acids were identified as acylated to spore proteins.
Conclusions:
- Bacillus megaterium spores contain unique non-phosphatide fatty acid components.
- These novel components, including those bound to proteins, are now amenable to analysis.