GadX Protein Represses btuB Gene in E. coli
Author Information
Author(s): Lei Guang-Sheng, Syu Wan-Jr, Liang Po-Huang, Chak Kin-Fu, Hu Wensi S, Hu Shiau-Ting
Primary Institution: National Yang-Ming University
Hypothesis
Is the btuB gene transcriptionally controlled by trans-acting factors such as GadX and GadY?
Conclusion
The study provides evidence that the expression of the btuB gene is transcriptionally repressed by the acid-responsive genes gadX and gadY.
Supporting Evidence
- GadX and GadY were found to decrease btuB promoter activity by approximately 50%.
- The production of BtuB protein was reduced by approximately 90% in the presence of GadX and GadY.
- Transcription of gadX increased by 1.4-fold under acidic conditions, while btuB transcription decreased to 57%.
Takeaway
This study found that a protein called GadX can turn off a gene in E. coli that helps the bacteria take in vitamin B12, especially when the bacteria are in an acidic environment.
Methodology
The study used a genomic library screening, lacZ reporter gene assays, Western blotting, and quantitative real-time PCR to analyze the effects of GadX and GadY on btuB expression.
Digital Object Identifier (DOI)
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