2022
DOI: 10.1038/s41467-022-28257-0
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PplD is a de-N-acetylase of the cell wall linkage unit of streptococcal rhamnopolysaccharides

Abstract: The cell wall of the human bacterial pathogen Group A Streptococcus (GAS) consists of peptidoglycan decorated with the Lancefield group A carbohydrate (GAC). GAC is a promising target for the development of GAS vaccines. In this study, employing chemical, compositional, and NMR methods, we show that GAC is attached to peptidoglycan via glucosamine 1-phosphate. This structural feature makes the GAC-peptidoglycan linkage highly sensitive to cleavage by nitrous acid and resistant to mild acid conditions. Using th… Show more

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Cited by 15 publications
(29 citation statements)
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References 99 publications
(119 reference statements)
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“…Thus, as a whole, Rha-CWPS appear to be polyanionic cell wall glycopolymers, similar to WTA. In a few cases, no phosphate group has been identified in the Rha-CWPS structures, but there is a possibility that it could be lost during acidic extraction procedures, as was reported for GAC in S. pyogenes ( 26 ).…”
Section: Attachment Of Side-chain Substituents Onto the Rhamnan Backb...mentioning
confidence: 95%
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“…Thus, as a whole, Rha-CWPS appear to be polyanionic cell wall glycopolymers, similar to WTA. In a few cases, no phosphate group has been identified in the Rha-CWPS structures, but there is a possibility that it could be lost during acidic extraction procedures, as was reported for GAC in S. pyogenes ( 26 ).…”
Section: Attachment Of Side-chain Substituents Onto the Rhamnan Backb...mentioning
confidence: 95%
“…For the sake of simplicity in this text, we will refer to this linear Rha-rich backbone as rhamnan in all cases. The rhamnan polymer is synthesized with a linker unit made of GlcNAc, which may be N -deacetylated to glucosamine (GlcNH 2 ) in certain cases ( 26 ). In addition, a cap structure made of sugar has been suggested by experimental data ( 14 , 27 ) but it is not known at present whether this is a conserved feature of Rha-CWPS.…”
Section: Diversity Of Rha-cwps Chemical Structuresmentioning
confidence: 99%
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