Ribosome biogenesis; the KsgA protein throws a methyl‐mediated switch in ribosome assembly
Bibliographic record
Abstract
Many trans-acting factors that aid in ribosome biogenesis have been identified in higher organisms but relatively few such factors are known in prokaryotes. In bacteria, the list of such factors includes ATP-energized helicases and chaperones as well as an emerging cadre of switch GTPases. The KsgA protein is a universally conserved methyltransferase that dimethylates both A1518 and A1519 of the 16S rRNA of the small ribosomal subunit. Methylation has long been thought to be solely for fine-tuning of protein translation. In this issue of Molecular Microbiology, Connolly et al. present data suggesting KsgA might function in the assembly of the small subunit of the ribosome. Indeed, the work indicates that KsgA might have a checkpoint role in ribosome biogenesis where methylation by this protein marks the completion of its assembly role. These findings open our thinking to new candidate assembly factors and provide a new direction for understanding ribosome assembly.
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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 | 0.001 | 0.004 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.015 | 0.008 |
| Insufficient payload (model declined to judge) | 0.005 | 0.006 |
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".