The low level of O antigen in Salmonella enterica Paratyphi A is due to inefficiency of the glycosyltransferase WbaV
| Autor: | Peter R. Reeves, Aditi Kidambi, Michael A. Liu |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Serotype
medicine.disease_cause Microbiology Group A 03 medical and health sciences Antigen Loss of Function Mutation Glycosyltransferase Genetics medicine Molecular Biology Gene 030304 developmental biology 0303 health sciences Mutation biology Strain (chemistry) 030306 microbiology Glycosyltransferases O Antigens biology.organism_classification Salmonella enterica Salmonella paratyphi A Bacterial Vaccines biology.protein |
| Zdroj: | FEMS Microbiology Letters. 368 |
| ISSN: | 1574-6968 |
| Popis: | The group A O antigen is the major surface polysaccharide of Salmonella enterica serovar Paratyphi A (SPA), and the focal point for most current vaccine development efforts. The SPA O-antigen repeat (O unit) is structurally similar to the group D1 O unit of S. enterica serovar Typhi, differing only in the presence of a terminal side-branch paratose (Par) in place of tyvelose (Tyv), both of which are attached by the glycosyltransferase WbaV. The two O-antigen gene clusters are also highly similar, but with a loss-of-function mutation in the group A tyv gene and the tandem amplification of wbaV in most SPA strains. In this study, we show that SPA strains consistently produce less O antigen than their group D1 counterparts and use an artificial group A strain (D1 Δtyv) to show this is due to inefficient Par attachment by WbaV. We also demonstrate that group A O-antigen production can be increased by overexpression of the wbaV gene in both the D1 Δtyv strain and two multi-wbaV SPA strains. These findings should be broadly applicable in ongoing vaccine development pipelines, where efficient isolation and purification of large quantities of O antigen is of critical importance. |
| Databáze: | OpenAIRE |
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