Physiological Consequences of Overexpression of a Twin-Arginine Translocase in Bacillus subtilis Revealed by 14N/15N Labeling
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View abstract on PubMed
Summary
This summary is machine-generated.Overexpressing the twin-arginine (Tat) translocase in Bacillus subtilis disrupts cellular functions like motility and biofilm formation. Arginine metabolism plays a key role in the bacterium
Area Of Science
- Microbiology
- Molecular Biology
- Systems Biology
Background
- Bacillus subtilis utilizes efficient secretion systems, including the twin-arginine (Tat) pathway, for exporting folded proteins.
- The TatAyCy translocase is crucial for protein export, and its overexpression recruits LiaH, potentially as a protective response.
- The complete physiological impact of TatAyCy-mediated protein translocation remains largely uncharacterized.
Purpose Of The Study
- To quantitatively analyze proteomic alterations in Bacillus subtilis under TatAyCy overexpression.
- To elucidate the cellular consequences of high-level TatAyCy expression on various biological processes.
- To identify key metabolic pathways involved in adapting to TatAyCy-induced cellular stress.
Main Methods
- Utilized 14N/15N metabolic labeling for quantitative proteomic analysis.
- Employed subcellular fractionation to analyze protein changes in different cellular compartments (cytoplasm, membrane, extracellular).
- Investigated the effects of TatAyCy overexpression on Bacillus subtilis physiology.
Main Results
- High-level TatAyCy expression resulted in a prolonged vegetative growth state.
- Key cellular processes including genetic competence, motility, chemotaxis, and biofilm formation were significantly disrupted.
- Arginine metabolism was identified as a central pathway in the cellular adaptation to TatAyCy-induced stress.
Conclusions
- Overexpression of the TatAyCy translocase imposes significant stress on Bacillus subtilis, altering its growth and behavior.
- The study highlights the disruption of fundamental cellular processes and points to arginine metabolism as a critical adaptive mechanism.
- These findings provide new insights into the complex physiological consequences of protein translocation via the Tat pathway.
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