Molecular characterization of the arginine deiminase system in <i>Listeria monocytogenes</i> : regulation and role in acid tolerance
Why this work is in the frame
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Bibliographic record
Abstract
The capacity of Listeria monocytogenes to withstand low pH is important for growth in low-pH foods, successful passage through the gastric barrier and survival within the macrophage phagosome. The ability of this pathogen to survive and adapt to acidic conditions is therefore predicted to play a significant role in the infectious cycle. In silico analysis of the L. monocytogenes genome revealed the presence of putative arginine deiminase (ADI) genes, which have been shown to play a role in the acid tolerance of other bacterial genera. In the present study, we show that L. monocytogenes possesses a functional ADI system and analysis of deletion mutants reveals that it contributes to both growth and survival of the bacterium under acidic conditions. An RT-PCR approach demonstrated that expression of ADI genes is increased in environments of low pH and anaerobicity and in the presence of arginine. A putative activator of ADI genes, namely ArgR, was identified and was shown to contribute to transcriptional regulation at this locus. Furthermore, expression of ADI genes was shown to be modulated by both the alternative stress sigma factor sigma(B) and the central virulence regulator PrfA. Finally, using the murine model of infection, we have established a role for the ADI system in the virulence of L. monocytogenes.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it