Structural Diversity and Plasticity Associated with Nucleotides Targeting Orotidine Monophosphate Decarboxylase
Bibliographic record
Abstract
Orotidine monophosphate decarboxylase (ODCase) generally accepts pyrimidine-based mononucleotides as ligands, but other nucleotides are also known to bind to this enzyme. We investigated the kinetic properties of eight common and endogenous nucleotides with ODCases from three species: Methanobacterium thermoautotrophicum, Plasmodium falciparum, and Homo sapiens. UMP and XMP exhibited higher affinities as compared to the other nucleotides tested. The product of ODCase catalyzed decarboxylation, UMP, displayed inhibition constants (K(i)) of 330 microM against the Mt enzyme and of 210 and 220 microM against the Pf and Hs ODCases, respectively. The K(i) values for XMP were 130 microM and 43 microM, respectively, for Mt and Pf ODCases. Interestingly, XMP's affinity for human ODCase (K(i) = 0.71 microM) is comparable and even slightly better than that of the substrate OMP. Binding of various nucleotides and their structural features in the context of ODCase inhibition and inhibitor design are discussed.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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 source (direct Gemma or distilled Codex), 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".