The Vertebrate Lysozyme Inhibitor Ivy Functions to Inhibit the Activity of Lytic Transglycosylase
Why this work is in the frame
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Bibliographic record
Abstract
The proteinaceous inhibitor of vertebrate lysozymes (Ivy) is produced by a collection of Gram-negative bacteria as a stress response to damage to their essential cell wall component peptidoglycan. A paralog of Ivy, Ivyp2 is produced exclusively by a number of pseudomonads, including Pseudomonas aeruginosa, but this protein does not inhibit the lysozymes, and its function was unknown. In this study, we demonstrate that the production of Ivy (homologs of both Ivyp1 and Ivyp2) correlates with bacteria that do not O-acetylate their peptidoglycan, a modification that controls the activity of the lytic transglycosylases. Furthermore, we show that both Ivy proteins are potent inhibitors of the lytic transglycoslyases, enzymes involved in the biosynthesis and maintenance of peptidoglycan. These data suggest that the true physiological function of the Ivy proteins is to control the autolytic activity of lytic transglycosylases within the periplasm of Gram-negative bacteria that do not produce O-acetylated peptidoglycan and that the inhibition of exogenous lysozyme by Ivy is simply a fortuitous coincidence.
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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 | 0.001 | 0.001 |
| 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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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