Periplasmic Binding Proteins Involved in Bacterial Iron Uptake
Why this work is in the frame
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Bibliographic record
Abstract
This chapter focuses on the structural biology of periplasmic binding proteins (PBPs) in general and, more specifically, on the iron binding PBPs whose structures have been solved: ferric ion binding proteins (FbpA), siderophore-binding protein (FhuD), and vitamin B12 binding protein (BtuF). It also discusses some studies of the TroA protein, which is structurally related to FhuD. Although not involved in iron transport or iron transport-related events, maltose binding protein (MBP) is one of the best-characterized PBPs and is therefore a good mechanistic model of periplasmic transport. A portion of the chapter describes different experimental techniques which have been used to characterize the motions that MBP undergoes on ligand association or dissociation. Although the binding pocket of FhuA is deeper than that of FhuD, it still could accommodate a more bulky ligand such as albomycin. Albomycin consists of an antibiotic group attached to a hydroxamate siderophore via an amino acyl linker. Although rational design of a novel, efficient antibiotic by chemical conjugation is challenging, the Trojan horse design may become increasingly important due to the growing problem of antibiotic resistance.
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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