Bibliographic record
Abstract
Cell-free systems allow for a reliable and consistent expression of recombinant proteins outside of a living cell, bypassing issues with genetic regulation and cellular noise (Hodgman and Jewett, 2012). Such systems are advantageous over cell-based synthetic biology due to the capability of tolerating toxins normally detrimental to the cell, increased freedom of design, reduced risk for biocontamination, and a rapid design-build-test cycle. Emerging as a new platform for synthetic biology, cell-free systems have shown potential for use in a variety of applications, including biofuel production, biomanufacturing, health and medicine. However, current cell-free systems are inaccessible due to their high cost or incredibly laborious lab work required to reproduce them. The goal of this work is to develop a completely customizable and accessible cell-free system composed of 38 proteins required for transcription and translation. Each protein is designed with a hexa-histidine tag on the N or C terminus to allow for easy nickel-sepharose purification. Protein overexpression and purification is verified using sodium dodecyl sulfate polyacrylamide electrophoresis (SDS- PAGE), and all 38 proteins are reconstituted to form a function cell-free system. 8 proteins have currently been successfully overexpressed and confirmed by SDS-PAGE. To simplify the process, multiple proteins are purified at once by combining cell pellets from multiple overexpressions and purifying them on a single nickel-sepharose column. The concentrations of purified proteins will be determined using mass spectroscopy. Preliminary results include successful multi-protein purification of four proteins (Release Factor 3, Histidine Synthetase, Tryptophan Synthetase and Ribosome Recycling Factor) on a single nickel-sepharose column, subsequently verified by SDS-PAGE. Future goals for this work include complete overexpression and purification of all 38 proteins, followed by functional validation. Ultimately, this work will provide a safe and customizable cell-free system for protein production. REFERENCE Hodgman, C.E. and M.C. Jewett, Cell-Free Synthetic Biology: Thinking Outside the Cell. Metabolic Engineering, 2012. 14(3): p. 261-269.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 0.004 |
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 source (direct Gemma or distilled Codex), 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".