Molecular biology and structure of a novel penaeid shrimp densovirus elucidate convergent parvoviral host capsid evolution
Bibliographic record
Abstract
Significance Parvoviruses (PVs) are ssDNA viruses, with T = 1 icosahedral symmetry, infecting deuterostome and protostome animals. Most PVs have a highly conserved phospholipase A2 domain (PLA2) in the N-terminal region of their minor capsid protein. Under acidic pH, during endosomal/lysosomal egress, the PLA2 domain is activated to disrupt vesicle membranes. However, certain PVs lack the PLA2 and thus must use a different escape mechanism. Our study offers insight into this enigma, showing how a recently discovered PV of marine crustacean has evolved a cation-dependent mechanism to accomplish this task. We also show how host-driven convergent evolution pushed two PVs, infecting the same host species, to adopt strikingly similar surface morphologies, despite distinct multimer interactions and lack of sequence similarity.
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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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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".