Cell‐Free Synthesis of Dopamine and Serotonin in Two Steps with Purified Enzymes
Bibliographic record
Abstract
The synthesis of serotonin and dopamine with purified enzymes is described. Both pathways start from an amino acid substrate and synthesize the monoamine neurotransmitter in two enzymatic steps. The enzymes human tryptophan hydroxylase isoform 2, Rattus norvegicus tyrosine hydroxylase, Chlamydia pneumoniae Cpn1046, and aromatic amino acid decarboxylase from Drosophila melanogaster are recombinantly expressed, purified, and shown to be functional in vitro. The hydroxylases efficiently convert L-DOPA (L-dihydroxy-phenylalanine) and 5-HTP (5-hydroxytryptophan) from L-tyrosine and L-tryptophan, respectively. A single aromatic amino acid decarboxylase is capable of converting both hydroxylated intermediates into the final neurotransmitter. The platform described here may facilitate future efforts to generate medically useful artificial cells and nanofactories.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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".