MvfR, a key <i>Pseudomonas aeruginosa</i> pathogenicity LTTR‐class regulatory protein, has dual ligands
Why this work is in the frame
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Bibliographic record
Abstract
MvfR (PqsR), a Pseudomonas aeruginosa LysR-type transcriptional regulator, plays a critical role in the virulence of this pathogen. MvfR modulates the expression of multiple quorum sensing (QS)-regulated virulence factors; and the expression of the phnAB and pqsA-E genes that encode functions mediating 4-hydroxy-2-alkylquinolines (HAQs) signalling compounds biosynthesis, including 3,4-dihydroxy-2heptylquinoline (PQS) and its precursor 4-hydroxy-2-heptylquinoline (HHQ). PQS enhances the in vitro DNA-binding affinity of MvfR to the pqsA-E promoter, to suggest it might function as the in vivo MvfR ligand. Here we identify a novel MvfR ligand, as we show that HHQ binds to the MvfR ligand-binding-domain and potentiates MvfR binding to the pqsA-E promoter leading to transcriptional activation of pqsA-E genes. We show that HHQ is highly produced in vivo, where it is not fully converted into PQS, and demonstrate that it is required for MvfR-dependent gene expression and pathogenicity; PQS is fully dispensable, as pqsH-mutant cells, which produce HHI but completely lack PQS, display normal MvfR-dependent gene expression and virulence. Conversely, PQS is required for full production of pyocyanin. These results uncover a novel biological role for HHQ; and provide novel insights on MvfR activation that may aid in the development of therapies that prevent or treat P. aeruginosa infections in humans.
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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 | 0.001 | 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