Tepsin and AP4 mediate transport from the trans-Golgi to the plant-like vacuole in toxoplasma
Bibliographic record
Abstract
Apicomplexan parasites are obligate intracellular pathogens possessing unique organelles but lacking several components of the membrane trafficking machinery conserved in other eukaryotes. While some of these components have been lost during evolution, others remain undetectable by standard bioinformatics approaches. Using a conditional splitCas9 system in Toxoplasma gondii, we previously identified TGGT1_301410, a hypothetical gene conserved among apicomplexans, as a potential trafficking factor. Here, we show that TGGT1_301410 is a distant ortholog of T. gondii tepsin (TgTEP), localized to the trans-Golgi and functioning as an accessory protein of the adaptor protein complex 4 (AP4). We demonstrate that AP4-TgTEP is essential for the actin-dependent transport of vesicles to the plant-like vacuole (PLVAC) and Golgi organization. Notably, our findings reveal that, unlike in metazoans, the AP4 complex in T. gondii utilizes clathrin as a coat protein, a mechanism more closely aligned with that of plants. These results underscore a conserved yet functionally adapted vesicular transport system in Apicomplexa.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.000 |
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".