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Pasteurella multocida exbB, exbD and tonB genes are physically linked but independently transcribed
Montserrat Bosch1, Elena Garrido, Montserrat Llagostera
1Department of Genetics and Microbiology, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain.
FEMS Microbiology Letters
|June 5, 2002
Summary
The Pasteurella multocida exbB, exbD, and tonB genes are crucial for virulence and are independently controlled by iron. These genes, though linked, do not form an operon but are essential for the infectious process.
Area of Science:
- Microbiology
- Molecular Biology
- Pathogen Research
Background:
- Pasteurella multocida is a significant animal pathogen.
- Understanding virulence factors is key to controlling infections.
- The exbB, exbD, and tonB genes are implicated in P. multocida pathogenesis.
Purpose of the Study:
- To clone and characterize the exbB, exbD, and tonB genes from P. multocida.
- To investigate the transcriptional organization and regulation of these genes.
- To determine the role of these genes in P. multocida virulence.
Main Methods:
- Cloning by complementation of an Escherichia coli tonB mutant.
- Reverse transcription PCR (RT-PCR) for transcriptional analysis.
- LacZ transcriptional fusions and insertional mutagenesis to study gene expression and function.
- Fur titration assays to assess iron regulation.
Main Results:
- The exbB, exbD, and tonB genes were successfully cloned.
- These genes are transcribed independently, not as an operon.
- Gene expression is regulated by iron levels, mediated by the Fur protein.
- All three genes are essential for P. multocida virulence and contribute equally to infection.
Conclusions:
- The exbB, exbD, and tonB genes are independently regulated virulence factors in P. multocida.
- Iron availability significantly influences the expression of these key genes.
- Targeting these genes could offer novel strategies for combating P. multocida infections.