Crystallization and preliminary X-ray analysis of 5′-methylthioribose kinase from<i>Bacillus subtilis</i>and<i>Arabidopsis thaliana</i>
Bibliographic record
Abstract
Recombinant Bacillus subtilis 5'-methylthioribose (MTR) kinase has been expressed, purified and subsequently crystallized using the hanging-drop vapor-diffusion technique. With PEG 2000MME as the precipitant, two different crystal forms have been grown in the absence and presence of the detergent CHAPS. These crystals belong to space groups P2(1)2(1)2(1) (unit-cell parameters a = 193.7, b = 83.2, c = 51.6 A) and P2(1)2(1)2 (unit-cell parameters a = 213.8, b = 83.2, c = 51.5 A), respectively. The crystals grown in the presence of CHAPS diffract to 2.2 A resolution at Station X8C, National Synchrotron Light Source (NSLS). For both crystal forms, the presence of two monomers per asymmetric unit is predicted (Matthews coefficient V(M) = 2.29 and 2.52 A(3) Da(-1), respectively). Recombinant C-terminally histidine-tagged Arabidopsis thaliana MTR kinase has also been expressed, purified and refolded into its active form. Rod-shaped crystals of this protein were grown from PEG 8000 using the hanging-drop vapor-diffusion technique. These crystals exhibit the symmetry of space group C2 (unit-cell parameters a = 162.3, b = 83.3, c = 91.0 A, beta = 117.8 degrees ) and diffract to 1.9 A resolution at Station X8C, NSLS. Two monomers are estimated to be present in the asymmetric unit (V(M) = 2.82 A(3) Da(-1)).
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 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".