Characterization of the lipopolysaccharide produced by Pasteurella multocida serovars 6, 7 and 16: Identification of lipopolysaccharide genotypes L4 and L8
Bibliographic record
Abstract
Pasteurella multocida is an important veterinary pathogen that produces a wide range of lipopolysaccharide (LPS) structures, many of which mimic host glycoproteins. In this study, we complete our analysis of the LPS produced by the P. multocida Heddleston serovars by reporting the LPS structure and the LPS outer core biosynthesis loci of the type strains representing Heddleston serovars 6, 7 and 16. Genetic analysis revealed that the type strains representing serovars 6 and 7 share the same LPS outer core biosynthesis locus which we have designated LPS genotype L4. Comparative bioinformatic analysis revealed that although the serovar 16 type strain contained a different LPS locus, L8, there was a significant degree of nucleotide identity between the L4 and L8 loci. Structural analysis revealed that the LPS glycoforms produced by the L4 and L8 strains all contained the highly conserved inner core produced by all other P. multocida strains examined to date. The residues within the LPS outer core produced by the L4 and L8 strains were either Gal or derivatives of Gal; unlike all other P. multocida Heddleston type strains examined there are no heptosyltransferases encoded in the L4 and L8 outer core biosynthesis loci. The structure of the L4 LPS outer core produced by the serovar 6 type strain consisted of β-Gal-(1-3)-β-N-acetylgalactosamine (GalNAc)-(1-4)-β-GalNAc3OAc-(1-4)-α-GalNAc3OAc-(1-3)-β-Gal, whereas the serovar 7 type strain produced a highly truncated LPS outer core containing only a single β-Gal residue. The structure of the L8 LPS outer core produced by the serovar 16 type strain consisted of β-Gal-(1-3)-β-GalNAc-(1-4)-(α-GalNAc-(1-3)-)-α-GalNAc.
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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) | 0.000 | 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 | 0.000 | 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".