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Deletions, insertions and rearrangements affecting rpoB gene expression.
Molecular & General Genetics : MGG
|June 7, 1979
Summary
Researchers located the rifampicin resistance (Rifr) gene, rpoB, using cloning and deletion experiments. Genetic and RNA polymerase binding data indicate that rpoB and rp/L genes share a common promoter.
Area of Science:
- Molecular Biology
- Genetics
- Microbiology
Background:
- The rifampicin resistance gene (rpoB) encodes a subunit of bacterial RNA polymerase.
- Understanding gene regulation is crucial for antibiotic resistance studies.
- Previous studies have not fully elucidated the transcriptional regulation of rpoB.
Purpose of the Study:
- To physically map the location of the rpoB gene.
- To investigate the transcriptional regulation of the rpoB gene.
- To determine if rpoB shares regulatory elements with other genes.
Main Methods:
- Cloning and deletion experiments using ColE1 hybrids.
- Physical restriction mapping of the rpoB gene.
- RNA polymerase binding assays.
Main Results:
- The rpoB gene was successfully located on a physical restriction map.
- RNA polymerase binding studies revealed no binding site within the structural rpoB gene.
- Genetic data suggested a shared regulatory element with the rp/L gene.
Conclusions:
- The rpoB gene is located on the physical map through molecular cloning techniques.
- The absence of an RNA polymerase binding site within the rpoB structural gene suggests external promoter control.
- Both the rp/L and rpoB genes are likely co-regulated, dependent on a common promoter.