Distribution and Molecular Characterization of mRNA-Binding Proteins Specific to the (U) <sub>15</sub> Region of 3′ UTR of the Mouse Catalase ( <i>Cas-1</i> )
Bibliographic record
Abstract
The 3' UTR of the mouse Cas-1 mRNA, encoding the antioxidant enzyme catalase, has a U-rich motif that is conserved across species. This motif is an active site for complex and dynamic interactions involving RNA-binding proteins. The spatial, temporal, and phylogenetic distribution of the Cas-1 3'-UTR U-rich motif-specific RNA-binding proteins was evaluated by gel mobility shift and UV cross-linking assays. The specific RNA-protein complexes were observed in mouse tissue homogenates representing developmental stages as early as day 10 pc and ranged in molecular weight from approximately 38 kDa to approximately 52 kDa. These mRNA-protein complexes appeared in all vertebrate species examined (human, mouse, rat, dog, rabbit, chicken, fish, and frog) but not in insects. The approximately 38-kDa protein was the most prominent protein in vertebrates. The cDNA sequence of the mouse approximately 38-kDa protein was obtained by purification of the protein, microsequencing, and RT-PCR. The resulting 456-nt sequence, representing the partial internal cDNA sequence, and its deduced amino acid sequence were similar to the RNA recognition motif (RRM) of a protein superfamily, implicated in splicing, stability, localization, and translation of RNAs. Although the results suggest that cis element-binding activity could be a cytoplasmic regulator of Cas-1 mRNA metabolism, the significance of this binding remains to be determined.
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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) | 0.001 | 0.001 |
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".