Solid‐phase synthesis of amanitin derivatives and preliminary evaluation of cellular uptake and toxicity
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
Abstract The study of transcriptional arrest is of great importance and can provide insight into the cellular response to various toxins, most notably chemotherapeutics. Therefore, specific inhibitors of RNA Polymerase II (RNAP II) could prove to be extremely useful. Given that α‐amanitin is one of the most potent and selective inhibitors of RNAP II, we prepared two amanitin derivatives on solid phase as a proof of principle towards the development of a One‐Bead‐One‐Compound (OBOC) amanitin chemical library. The amatoxin family comprises several related toxic peptides that are characterized by a defined rigid bicyclic structure based on a head‐to‐tail cyclized octapeptide, with a transannular tryptathionine crosslink. The latter is prepared via the Savige‐Fontana tryptathionylation of the oxidized tryptophan derivative 3 a ‐hydroxypyrrolo[2,3‐ b ]indoline in neat TFA. We synthesized a new fluorescently labelled S‐deoxo‐[Asn 1 ‐TEG‐DEAC, Ile 3 ]‐amaninamide (Ile 3 ‐Ama) and studied its ability to be taken up by CHO cells and to stain the nucleus, the site of transcriptionally active DNA. Towards the solid phase synthesis of an amanitin‐inspired library, we synthesized a linker that is stable both in TFA, used to promote the tryptathionine crosslink, and base used for Fmoc‐deprotection. The linker allowed the full synthesis of an amanitin derivative on solid phase, including tryptathionylation and macrolactamization.
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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 | 0.001 | 0.001 |
| 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 | 0.001 |
| 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