Members of a Novel Kinase Family (DUF1537) Can Recycle Toxic Intermediates into an Essential Metabolite
Bibliographic record
Abstract
DUF1537 is a novel family of kinases identified by comparative genomic approaches. The family is widespread and found in all sequenced plant genomes and 16% of sequenced bacterial genomes. DUF1537 is not a monofunctional family and contains subgroups that can be separated by phylogenetic and genome neighborhood context analyses. A subset of the DUF1537 proteins is strongly associated by physical clustering and gene fusion with the PdxA2 family, demonstrated here to be a functional paralog of the 4-phosphohydroxy-l-threonine dehydrogenase enzyme (PdxA), a central enzyme in the synthesis of pyridoxal-5'-phosphate (PLP) in proteobacteria. Some members of this DUF1537 subgroup phosphorylate l-4-hydroxythreonine (4HT) into 4-phosphohydroxy-l-threonine (4PHT), the substrate of PdxA, in vitro and in vivo. This provides an alternative route to PLP from the toxic antimetabolite 4HT that can be directly generated from the toxic intermediate glycolaldehyde. Although the kinetic and physical clustering data indicate that these functions in PLP synthesis are not the main roles of the DUF1537-PdxA2 enzymes, genetic and physiological data suggest these side activities function has been maintained in diverse sets of organisms.
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How this classification was reachedexpand
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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".