Identification of Active Site Residues in Glycosidases by Use of Tandem Mass Spectrometry
Bibliographic record
Abstract
The glycosidases are a class of enzymes that are responsible for the hydrolysis of glycosidic bonds. Such glycosidic linkages occur in a wide range of contexts, including polysaccharides, oligosaccharides, glycolipids, glycoproteins, lipopolysaccharides, proteoglycans, saponins, and a range of other glycoconju-gates. Corresponding to this diverse collection of substrates there is a very large assortment of glycosidases responsible for their selective hydrolysis. Amino acid sequences are now available for well over 2000 of these enzymes, and these have been arranged into families on the basis of sequence similarities (1–4). At the last count (November 1999) there were 76 such families, and a regularly updated list of these is readily available at the URL http://afmb.cnrs-mrs.fr/ R~pedro/CAZY/db.html . A large amount of effort has been expended on structural studies of these enzymes in the past 10 yr with the result that three-dimensional X-ray crystal structures are now available for representatives of at least 27 of these families (4–6). These structures are remarkably diverse, with monomer sizes ranging from approx 14,000 to 170,000 Daltons, and compositions ranging from essentially completely α-helical to almost exclusively β-sheet. The reasons for this diversity are probably twofold; the diverse nature of the substrates themselves, and different evolutionary pathways to the construction of an active site.
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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) | 0.002 | 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".