Characterization of binding‐induced changes in dynamics suggests a model for sequence‐nonspecific binding of ssDNA by replication protein A
Why this work is in the frame
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Bibliographic record
Abstract
Single-stranded-DNA-binding proteins (SSBs) are required for numerous genetic processes ranging from DNA synthesis to the repair of DNA damage, each of which requires binding with high affinity to ssDNA of variable base composition. To gain insight into the mechanism of sequence-nonspecific binding of ssDNA, NMR chemical shift and (15)N relaxation experiments were performed on an isolated ssDNA-binding domain (RPA70A) from the human SSB replication protein A. The backbone (13)C, (15)N, and (1)H resonances of RPA70A were assigned for the free protein and the d-CTTCA complex. The binding-induced changes in backbone chemical shifts were used to map out the ssDNA-binding site. Comparison to results obtained for the complex with d-C(5) showed that the basic mode of binding is independent of the ssDNA sequence, but that there are differences in the binding surfaces. Amide nitrogen relaxation rates (R(1) and R(2)) and (1)H-(15)N NOE values were measured for RPA70A in the absence and presence of d-CTTCA. Analysis of the data using the Model-Free formalism and spectral density mapping approaches showed that the structural changes in the binding site are accompanied by some significant changes in flexibility of the primary DNA-binding loops on multiple timescales. On the basis of these results and comparisons to related proteins, we propose that the mechanism of sequence-nonspecific binding of ssDNA involves dynamic remodeling of the binding surface.
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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