A novel acetyl xylan esterase enabling complete deacetylation of substituted xylans
Why this work is in the frame
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Bibliographic record
Abstract
Acetylated 4- O -(methyl)glucuronoxylan (GX) is the main hemicellulose in deciduous hardwood, and comprises a β-(1→4)-linked xylopyranosyl (Xyl p ) backbone substituted by both acetyl groups and α-(1→2)-linked 4- O -methylglucopyranosyluronic acid (MeGlc p A). Whereas enzymes that target singly acetylated Xyl p or doubly 2,3- O -acetyl-Xyl p have been well characterized, those targeting (2- O -MeGlc p A)3- O -acetyl-Xyl p structures in glucuronoxylan have remained elusive. An unclassified carbohydrate esterase (FjoAcXE) was identified as a protein of unknown function from a polysaccharide utilization locus (PUL) otherwise comprising carbohydrate-active enzyme families known to target xylan. FjoAcXE was shown to efficiently release acetyl groups from internal (2- O -MeGlc p A)3- O -acetyl-Xyl p structures, an activity that has been sought after but lacking in known carbohydrate esterases. FjoAcXE action boosted the activity of α-glucuronidases from families GH67 and GH115 by five and nine times, respectively. Moreover, FjoAcXE activity was not only restricted to GX, but also deacetylated (3- O -Ara f )2- O -acetyl-Xyl p of feruloylated xylooligomers, confirming the broad substrate range of this new carbohydrate esterase. This study reports the discovery and characterization of the novel carbohydrate esterase, FjoAcXE. In addition to cleaving singly acetylated Xyl p , and doubly 2,3- O -acetyl-Xyl p , FjoAcXE efficiently cleaves internal 3- O -acetyl-Xyl p linkages in (2- O -MeGlc p A)3- O -acetyl-Xyl p residues along with densely substituted and branched xylooligomers; activities that until now were missing from the arsenal of enzymes required for xylan conversion.
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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 | 0.000 |
| 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