Incorporation of transuranium elements: coordination of Cm(<scp>iii</scp>) to human serum transferrin
Bibliographic record
Abstract
The coordination environment of Cm(iii) bound at the Fe(iii) binding sites of transferrin was investigated using a combined experimental and theoretical approach. Complexation studies with two hTf/2N single point mutants, Y95F (Tyr → Phe) and H249A (His → Ala) were performed. The substitution of Tyr 95 by the non-complexing Phe prevents Cm(iii) from forming of a strong, multidentate complex with the mutant. In contrast, with the H249A mutant Cm(iii) complexation at the binding site still occurs although a slightly higher pH is required to form the complex. This elucidates that His plays a minor role and is not a key ligand like Tyr 95. MD/DFT calculations of Cm(iii) bound at the N-terminal binding site provide further structural information. All coordinating groups present in the Fe(iii) transferrin complex are also found for Cm(iii), i.e. Asp 63, Tyr 95, Tyr 188 and His 249. Additionally, two water molecules, one monodentate and one bidentate carbonate ion complete the coordination environment. This structure of the Cm(iii) hTf/2N complex is confirmed by vibronic sideband spectroscopy which allows an identification of the directly coordinating groups. The results underline an involvement of Asp 63, Tyr 95, Tyr 188 and His 249 as well as carbonate in Cm(iii) coordination at the transferrin Fe(iii) binding site.
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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 | 0.000 | 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 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".