LLP1 is a pyrophosphatase involved in homeostasis/quality control of dolichol-linked oligosaccharide
Bibliographic record
Abstract
Dolichol-linked oligosaccharide (DLO) is the precursor for asparagine (N)-linked protein glycosylation. DLO synthesis can be impaired by genetic and environmental factors, leading to the accumulation of various immature DLO intermediates that are subsequently cleaved into phosphorylated oligosaccharides (POSs). Despite the fact that its activity has been known since the 1970s, the identity of the enzyme has not been clarified. Here, we identified a Saccharomyces cerevisiae gene encoding a DLO-pyrophosphatase (Llp1), which converts DLO to POSs. Intriguingly, LLP1 mRNA was translated through a programmed +1 translational frameshifting. LLP1 orthologs encode members of VanZ family proteins, which are found in various bacteria and fungi. Llp1 and its substrate DLO are likely to be localized in the Golgi, and when LLP1 was knocked out, abnormal DLO modified by Golgi mannosyltransferases accumulated, which is consistent with a role in DLO homeostasis/quality control. This study provides insights into how the cellular levels and quality of DLOs are maintained in eukaryotes.
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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) | 0.001 | 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".