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Updated: Aug 4, 2026

Imaging Mismatch Repair and Cellular Responses to DNA Damage in Bacillus subtilis
Published on: February 9, 2010
The methionine salvage pathway in Bacillus subtilis
Agnieszka Sekowska1, Antoine Danchin
1HKU-Pasteur Research Centre, Dexter HC Man Building, 8, Sassoon Road, Pokfulam, Hong Kong, China. sekowska@hkucc.hku.hk
Bacillus subtilis recycles methylthioribose (MTR) for methionine salvage using a dioxygen-dependent pathway. A Rubisco analog, MtnW, is crucial, and its absence causes MTR toxicity, offering a new antimicrobial drug target.
Area of Science:
- Microbiology
- Biochemistry
- Enzymology
Background:
- Polyamine synthesis generates methylthioadenosine, necessitating cellular disposal.
- Methylthioribose (MTR) is central to recycling this compound into methionine.
- Limited knowledge existed regarding MTR recycling in Bacillus subtilis.
Purpose of the Study:
- To elucidate the methionine salvage pathway in Bacillus subtilis.
- To identify the proteins involved in MTR recycling.
- To investigate the role of MTR recycling in cellular protection.
Main Methods:
- In silico genome analysis.
- Transposon mutagenesis in Bacillus subtilis.
- Gene expression analysis (Northern blotting, lacZ reporter assays).
- Promoter identification via primer extension.
Main Results:
- The dioxygen-dependent methionine salvage pathway in B. subtilis was uncovered.
- The pathway shares similarities with Klebsiella pneumoniae but utilizes different proteins.
- A ribulose diphosphate carboxylase (Rubisco) analog, MtnW, plays a key role in MTR recycling.
- MtnW deficiency leads to extreme MTR toxicity.
Conclusions:
- Bacillus subtilis possesses a complete methionine salvage pathway.
- The pathway employs unique proteins, including the Rubisco paralogue MtnW.
- MtnW is essential for mitigating MTR toxicity.
- This pathway provides protection against dioxygen in the phylloplane environment.
- The MtnW-dependent step presents a potential target for antimicrobial drug development.
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