Measuring Staphylococcal Promoter Activities Using a Codon-Optimized β-Galactosidase Reporter.

Area of Science:

• Microbiology
• Molecular Biology
• Biochemistry

Background:

• The lacZ gene and beta-galactosidase enzyme are established tools for bacterial reporter systems.
• Standard protocols exist for analyzing bacterial gene expression in various growth conditions.

Purpose of the Study:

• To adapt and optimize the lacZ reporter system for analyzing expression profiles in Staphylococcus aureus.
• To develop high-throughput screening methods for promoter reporter constructs.

Main Methods:

• Utilizing the lacZ gene and beta-galactosidase enzyme for bacterial reporter assays.
• Adapting standard broth culture protocols for 96-well plate high-throughput screening.
• Employing codon-optimization of the E. coli lacZ gene for enhanced beta-galactosidase activity in S. aureus.

Main Results:

• Demonstrated successful analysis of expression profiles from S. aureus grown on solid media and in broth culture.
• Adapted the standard broth protocol for 96-well plate high-throughput screening of promoter reporter constructs.
• Codon-optimization of the lacZ gene significantly improved beta-galactosidase activity in S. aureus, enhancing assay sensitivity.

Conclusions:

• The lacZ reporter system, particularly with codon-optimization, is a versatile and sensitive tool for S. aureus transcriptional profiling.
• The developed high-throughput methods facilitate efficient screening of promoter activity under diverse conditions.
• This approach enables improved detection of low-activity promoters and use of smaller sample volumes in S. aureus research.