Pnk1, a DNA Kinase/Phosphatase Required for Normal Response to DNA Damage by γ-Radiation or Camptothecin inSchizosaccharomyces pombe
Why this work is in the frame
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Bibliographic record
Abstract
We report the characterization of Pnk1, a 45-kDa homolog of the human polynucleotide kinase PNKP in Schizosaccharomyces pombe. Recombinant Pnk1 like human PNKP exhibits both 5'-DNA kinase and 3'-DNA phosphatase activities in vitro. Furthermore, we detected 3'-DNA phosphatase activity with a single-stranded substrate in extracts from wild-type yeast, but no activity was detected in pnk1delta strains. We have shown that GFP-tagged Pnk1 like mammalian PNKP localizes to the nucleus. Deletion of pnk1 does not affect cell growth under normal conditions but results in significant hypersensitivity to gamma-radiation or camptothecin, an inhibitor of topoisomerase I, suggesting that Pnk1 plays an important role in the repair of DNA strand breaks produced by these agents. The pnk1 deletion mutants were not hypersensitive to ethyl methanesulfonate, methyl methanesulfonate, or 4-nitroquinoline N-oxide. Expression of human PNKP in pnk1delta cells restores resistance to gamma-radiation or camptothecin, suggesting that the functions of yeast Pnk1 and human PNKP have been conserved.
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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