Brews, fuels, and opioids: Expanding the yeast Ehrlich pathway for chemical and pharmaceutical manufacturing
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
The Ehrlich pathway is a catabolic process that imparts Saccharomyces cerevisiae and other yeasts with the ability to utilize branched-chain and aromatic amino acids as a source of nitrogen. Using this route, amino acids are transaminated to α-keto acids and the liberated ammonia is utilized for assimilatory reactions. This process leaves behind an array of aliphatic and aromatic carbon skeletons (fusel metabolites) that have found a multitude of uses in the production of flavors, chemicals, and pharmaceuticals. This review provides an update on the genetics and biochemistry of the Ehrlich pathway with an emphasis on the biotechnological valorization of fusel metabolites. We outline the impact of fusel metabolism on the organoleptic properties of fermented beverages and recap ongoing efforts to repurpose the Ehrlich pathway for production of advanced biofuels. We also highlight recent activity directed at producing opioids and other plant benzylisoquinolines, as well as engineering new-to-nature alkaloids by rewiring the yeast Ehrlich pathway. Collectively, these efforts have stimulated a deeper understanding of yeast fusel metabolism and opened new opportunities for biomanufacturing using conventional and non-conventional yeasts.
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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) | 0.001 | 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 | 0.001 | 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 it