Characterization of the Regulation and Function of Phosphatidylinositol 3,5-Bisphosphate
Bibliographic record
Abstract
PtdIns(3,5)P2 is a low abundance phosphoinositide that is involved in a variety of cellular processes. Most notably, PtdIns(3,5)P2 is known to regulate vacuolar/lysosomal morphology. Deficiency in PtdIns(3,5)P2 results in enlargement of the yeast vacuole and, an extensive vacuolation of the late endocytic compartments in higher eukaryotes (1, 2). In addition, PtdIns(3,5)P2 is also involved in cellular functions including membrane trafficking, autophagy, and vacuolar/lysosomal acidification. However, the current study provided evidence that shows that the vacuole/lysosomes of PtdIns(3,5)P2-deficient cells remain acidic. Hence, PtdIns(3,5)P2 may not have a role in steady-state vacuolar/lysosomal acidification. PtdIns(3,5)P2 is synthesized by the Fab1 lipid kinase and degraded by the antagonistic Fig4 lipid phosphatase. Vac14, an adaptor protein, is known to interact with both Fab1 and Fig4 to form a complex on the vacuolar membrane. This study demonstrated that Vac14 is required to form a homodimer for its interaction with Fig4 and Fab1. In addition, formation of the homodimer is necessary for regulation of PtdIns(3,5)P2. Mutations in human Vac14 and Fig4 has been identified in patients with neurodegenerative diseases, such as amyotrophic lateral sclerosis and Charcot-Marie-Tooth Type 4J (3, 4). This study provides an important stepping stone in characterizing the regulatory mechanism and understanding the function of PtdIns(3,5)P2
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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".