The Acidic Activation Domain of the Baculovirus Transactivator IE1 Contains a Virus-Specific Domain Essential for DNA Replication
Bibliographic record
Abstract
IE1 is a potent transcriptional transactivator of the baculovirus Orgyia pseudotsugata multiple nucleopolyhedrovirus (OpMNPV) and has been shown to be essential for viral DNA replication. IE1 contains an acidic activation domain (AAD) at the N terminus that is essential for transcriptional transactivation, but its role in viral DNA replication is unknown. In this study the role of the IE1 AAD in DNA replication is investigated. We have determined that deletion of the AAD eliminates the ability of IE1 to support DNA replication, showing that the AAD is essential for DNA replication as well as transcriptional transactivation. Replacement of the AAD with the archetype domain from herpesvirus VP16 and the evolutionarily related domain from Autographa californica MNPV (AcMNPV) IE1 produces chimeric proteins that are potent transactivators. Surprisingly, however, these chimeric proteins were unable to support DNA replication, indicating that there is a host- or virus-specific replication subdomain in the AAD that was not functionally replaced by the VP16 or AcMNPV AAD. Using N- and C-terminal deletion mutants, the region of the AAD that was essential for DNA replication was mapped to amino acids 1 to 65. AAD deletion mutants also showed that an IE1 that is functional for transcriptional transactivation is not required for viral DNA replication. The IE1 AAD therefore contains an essential replication domain that is separable from the transcriptional activation domains. Our results suggest that IE1 specifically interacts with a component of the viral replication complex, supporting the view that it acts as a nucleating factor by binding to the viral replication origins.
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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 | 0.001 |
| 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".