Comparing β-galactosidase Production in Lactobacillus Strains
Author Information
Author(s): Nguyen Tien-Thanh, Nguyen Thu-Ha, Maischberger Thomas, Schmelzer Philipp, Mathiesen Geir, Eijsink Vincent GH, Haltrich Dietmar, Peterbauer Clemens K
Primary Institution: University of Natural Resources and Life Sciences Vienna, Austria
Hypothesis
The study investigates why Lactobacillus reuteri produces more β-galactosidase than Lactobacillus acidophilus despite similar expression strategies.
Conclusion
The study found that differences in mRNA levels, influenced by translational effects, are responsible for the varying β-galactosidase production in Lactobacillus strains.
Supporting Evidence
- Lactobacillus plantarum strains with different plasmids showed significant differences in β-galactosidase activity.
- mRNA levels for β-galactosidases were up to 60-fold higher in Lactobacillus reuteri compared to Lactobacillus acidophilus.
- The plasmid copy numbers were similar for both strains throughout the fermentation process.
Takeaway
This study shows that even when two bacteria are treated the same way, one can make a lot more of a certain enzyme than the other because of how their genes work.
Methodology
The study used quantitative PCR to compare plasmid copy numbers and mRNA levels of β-galactosidases in Lactobacillus strains.
Limitations
The study does not explore all potential factors affecting mRNA stability and translation efficiency.
Digital Object Identifier (DOI)
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