Mutated-?-actin restores growth to a yeast amino acid transport defective mutant
Bibliographic record
Abstract
A mutated yeast cell 22574d lacking all three proline transporters, PUT4, UGA4, and GAP1, and incapable of growth on proline recovers its lost ability to grow on proline as sole nitrogen source when transformed with a mutagenized mouse γ-actin cDNA (M-γ-A). Native mouse γ-actin cDNA is ineffective. The 3′-region of γ-actin cDNA was mutagenized to resemble E51 cDNA previously isolated from Ehrlich tumor cells. The E51 cDNA has an extended reading frame in the 3′-region compared to that in native γ-actin. The extension of the open reading frame in E51 cDNA, was found to be due to an additional pair of bases (TG) at position 1104 of E51 cDNA. After site-directed mutagenesis of the 3′-region of native γ-actin cDNA to resemble that of E51 cDNA, the construct, M-γ-A cDNA, was expressed in the 22574d yeast. While the transformation with M-γ-A increased the uptake of both proline and γ-amino butyric acid, the transport of five other solutes was not changed by this transformation. Northern blotting of the nontransformed and the M-γ-A-transformed 22574d cells with gene-specific probes for the three proline transporters showed the expression of an mRNA for UGA4 in both transformed and nontransformed cells but no evidence for the expression of GAP1 or PUT4. The mRNA for UGA4 was expressed at a lower level in strain 22574d than in the parent yeast Σ1278b. Furthermore, the message in the mutated cells is smaller in size by about 15%. These results are consistent with the synthesis of a mutated transporter which requires the coexpression of M-γ-A, but not native γ-actin, to restore physiological function, i.e., proline or γ-amino acid transport. J. Cell. Physiol. 186:124–135, 2001. © 2001 Wiley-Liss, Inc.
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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".