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Differential translation of cell division proteins
1Department of Molecular Biology, University of Edinburgh, Scotland.
Journal of Bacteriology
|October 1, 1990
Summary
Bacterial cell division proteins FtsQ and FtsA are produced at low levels due to their specific ribosome-binding sequences, not translational coupling. Beta-lactamase production is significantly higher than FtsQ, indicating differential translation efficiency.
Area of Science:
- Molecular Biology
- Bacterial Genetics
- Protein Synthesis Regulation
Background:
- Bacterial cell division is a complex process regulated by numerous proteins, including FtsQ and FtsA.
- Understanding the regulation of gene expression, particularly translation, is crucial for comprehending bacterial growth and division.
- Previous studies have indicated differential protein production levels for essential division machinery.
Purpose of the Study:
- To investigate the translational efficiency of bacterial division genes (ftsQ and ftsA) compared to a control gene (bla).
- To determine the factors responsible for the differential production rates of FtsQ and FtsA proteins.
- To assess the role of translational coupling and ribosome-binding sequences in regulating the expression of ftsQ and ftsA.
Main Methods:
- Cloning of ftsQ, ftsA, and bla genes under a bacteriophage T7 promoter for controlled in vivo transcription.
- Analysis of protein production ratios using quantitative measurements.
- Examination of ribosome-binding sequences and their impact on translation initiation efficiency.
Main Results:
- Single messenger RNAs (mRNAs) encoding different proteins were translated with significantly varying efficiencies.
- Beta-lactamase (bla) production was approximately 75-fold higher than FtsQ production.
- The low production rates of FtsQ and FtsA are attributed to their specific ribosome-binding sequences, not translational coupling, despite gene proximity. FtsA translation levels correlated directly with transcription levels.
Conclusions:
- Differential translation efficiencies, primarily governed by ribosome-binding sequences, play a key role in regulating the production of bacterial cell division proteins.
- There is no obligatory translational coupling between the ftsQ and ftsA genes.
- The regulation of FtsA and FtsQ protein levels is mainly determined at the translational level, with no evidence of variable translational regulation for FtsA.