Molecular and biochemical characterization of a recombinant glycosyl hydrolase family 3 β-glucosidase overexpressed in Escherichia. coli; bioprospecting metagenomes for cellulolytic processing function
Why this work is in the frame
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Bibliographic record
Abstract
Enzyme activity on a synthetic substrate ( p -nitrophenyl-β-D-glucopyranoside ( p NPG)) ranked by specificity (k cat /K m ), placed Bgl-3 (a recombinant P. carotovorum subsp. carotovorum -ß-glucosidase expressed in Escherichia coli ) in a group of ß-glucosidases, whereas ranking according to turnover number (k cat ) placed Bgl-3 at the top of the group, implying its potential for high activity in biomass processing. The role of Lys211, His212, Arg172, and Asp114, in substrate recognition and stabilization of a glucose unit in catalysis is proposed here due to interactions with the substrate C1-C6 hydroxyls through hydrogen bonding, as well as the role of two methionines, Met255, Met322, in hydrophobic stabilization. However, enzyme inactivation due to ion pair dissociation, at pH range >8 and <5, of the enzyme nucleophile and the acid-base, can influence enzyme-intermediate complex formation, suggesting the latter as rate limiting in Bgl3 catalysis. Asp290 and Glu517 in the substrate binding clefts, are the nucleophile and the catalytic acid/base suggested, respectively. The close proximity of His212 and His522 stabilizes the enzyme glycosyl-intermediate through hydrogen bonding.
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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) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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 it