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Fluorescence Live-cell Imaging of the Complete Vegetative Cell Cycle of the Slow-growing Social Bacterium Myxococcus xanthus
Published on: June 20, 2018
Lipolytic enzymes in Myxococcus xanthus
Aurelio Moraleda-Muñoz1, Lawrence J Shimkets
1Department of Microbiology, University of Georgia, Athens, GA 30602, USA.
Journal of Bacteriology
|February 20, 2007
Summary
Myxococcus xanthus lipolytic enzymes, including patatin, alpha/beta hydrolase, and GDSL families, were characterized. Deletions in specific lipolytic genes accelerated development and increased myxospore yields, impacting bacterial growth.
Area of Science:
- Microbiology
- Enzymology
- Molecular Biology
Background:
- Myxococcus xanthus genome encodes lipolytic enzymes across three families: patatin, alpha/beta hydrolases, and GDSL.
- Characterization of individual lipolytic enzyme members provides insight into their functions.
Purpose of the Study:
- To characterize three lipolytic enzymes from Myxococcus xanthus belonging to patatin, alpha/beta hydrolase, and GDSL families.
- To investigate the impact of gene deletions on bacterial development and myxospore formation.
- To determine the substrate specificity of purified lipolytic enzymes.
Main Methods:
- Gene deletion and characterization of Myxococcus xanthus strains.
- Translational lacZ fusions for gene expression analysis during development and vegetative growth.
- Overexpression of lipolytic enzymes in Escherichia coli and substrate specificity assays using p-nitrophenyl esters.
Main Results:
- Deletion mutants of MXAN_5522 (alpha/beta hydrolase) and MXAN_4569 (GDSL lipase) exhibited accelerated development and earlier myxospore formation.
- The MXAN_5522 mutation led to significantly higher spore yields compared to wild-type.
- Gene expression analysis revealed developmental and vegetative expression patterns for the studied lipolytic genes.
- Purified enzymes showed preferential hydrolysis of short-chain fatty acid esters, with highest activity against p-nitrophenyl acetate.
Conclusions:
- Lipolytic enzymes encoded by MXAN_5522 and MXAN_4569 play a role in regulating Myxococcus xanthus development and sporulation.
- These enzymes exhibit substrate specificity for short-chain fatty acid esters.
- Understanding these lipases contributes to the knowledge of bacterial physiology and enzyme function.
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