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Elastase gene expression in non-elastase-producing Pseudomonas aeruginosa strains using novel shuttle vector systems
T Ishii1, J Fukushima, S Fujita
1Department of Bacteriology, Yokohama City University School of Medicine, Japan.
FEMS Microbiology Letters
|March 1, 1994
Summary
Non-elastase-producing Pseudomonas aeruginosa strains can express foreign elastase genes. Specific DNA bases were identified as crucial for suppressing elastase gene expression in certain strains.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- Pseudomonas aeruginosa is an opportunistic pathogen known for producing elastase, an important virulence factor.
- Some strains of P. aeruginosa do not produce elastase, and the reasons for this are not fully understood.
Purpose of the Study:
- To investigate the ability of non-elastase-producing P. aeruginosa strains to express foreign elastase genes.
- To identify genetic factors responsible for the lack of elastase production in specific strains.
Main Methods:
- Introduction of elastase genes from P. aeruginosa IFO3455, PA103, and N-10 into non-elastase-producing strains (N-10, PA103, IFO3080).
- Construction and expression analysis of deleted or chimeric elastase genes using 5'-upstream regions.
- Assessment of gene expression, secretion, and precursor processing.
Main Results:
- Non-elastase-producing strains N-10 and IFO3080 demonstrated normal elastase gene expression, secretion, and processing systems.
- P. aeruginosa PA103's elastase structural gene and 5'-upstream regions were found to be normal.
- P. aeruginosa N-10 and IFO3080 carrying the PA103 elastase gene successfully produced elastase.
- Two specific DNA bases were identified as critical in suppressing P. aeruginosa N-10 elastase gene expression.
Conclusions:
- The gene expression, secretion, and processing systems for elastase are functional in non-elastase-producing P. aeruginosa N-10 and IFO3080.
- The lack of elastase expression in these strains is likely due to regulatory factors, specifically identified DNA bases, rather than defects in the structural gene or basic processing machinery.