Cyclophilin A, a Novel Component of <i>Listeria monocytogenes</i> Comet Tails
Bibliographic record
Abstract
The intracellular bacterium Listeria monocytogenes hijacks the actin polymerization machinery within human cells for its entry, intracellular movement and subsequent spreading from cell‐to‐cell. Intracellular motility of Listeria involves Arp2/3‐mediated actin polymerization at one pole of the bacteria, resulting in the generation of structures known as comet tails. During cell‐to‐cell spreading, comet tails protrude from the host cell membrane from structures referred to as listeriopods. Although the minimal protein constituents required for these actin‐based structures were identified years ago, a complete understanding of the molecular constituents and their specific functions at these sites remains to be investigated. Cyclophilin A (CypA) is a cytosolic protein involved in protein folding and potentially actin nucleation. Thus, because Listeria depends on actin‐based structures for crucial events in its disease process, we tested the hypothesis that CypA is recruited to Listeria comet tails and sites of cell‐to‐cell bacterial spreading. Through the use of fluorescently‐tagged CypA DNA constructs and time‐lapse imaging, we demonstrate that CypA is present at 1) the surface of Listeria prior to comet tail formation, 2) comet tails themselves and 3) listeriopods. Our data reveals a new component in the actin‐based motility of Listeria and suggests that CypA may play a crucial role in the cell‐to‐cell spreading of Listeria. Grant Funding Source : NSERC and departmental funds
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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) | 0.002 | 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".