TraG-edy to Triumph: How Challenges in Crystallisation Efforts of TraG Led to Success
Why this work is in the frame
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Bibliographic record
Abstract
For many projects involving the structural solution of a protein, a high-resolution crystal structure is a desirable goal for completing the project. However, protein crystallisation is a bottleneck to success; what do you do if a protein never crystallizes, and you don't have access to cryo-EM? TraG is a desirable structural target; it is a protein found in F-like Type IV Secretion Systems (T4SS) for the transmission of mobile DNA elements in gram-negative bacteria, serving as a major contributor to antibiotic resistance (Figure 1)1. TraG is essential in preventing redundant DNA transfer through a process termed entry exclusion, and the protein has no homologs with solved structures. Structural studies of TraG revealed the presence of a dynamic region between the N- and C-terminal domains of the protein; thermofluor, circular dichroism, collision induced unfolding mass spectrometry and SEC-MALS-SAXS experiments guided the design of mutants to lower flexibility and promote protein crystallisation. Despite years of effort and a variety of crystallisation techniques employed, a diffraction-quality crystal was not obtained. However, this led to similar examinations of other proteins in the F-like T4SS, which were then found to have dynamic regions as well and provided context to how the conjugative T4SS operates as a complex (Figure 2).
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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 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 it