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Streptococcus pyogenes TrxSR Two-Component System Regulates Biofilm Production in Acidic Environments
Ist Teil von
Infection and immunity, 2021-10, Vol.89 (11), p.e0036021
Ort / Verlag
United States: American Society for Microbiology
Erscheinungsjahr
2021
Quelle
MEDLINE
Beschreibungen/Notizen
Bacteria form biofilms for their protection against environmental stress and produce virulence factors within the biofilm. Biofilm formation in acidified environments is regulated by a two-component system, as shown by studies on isogenic mutants of the sensor protein of the two-component regulatory system in Streptococcus pyogenes. In this study, we found that the LiaS histidine kinase sensor mediates biofilm production and pilus expression in an acidified environment through glucose fermentation. The
isogenic mutant produced biofilms in a culture acidified by hydrochloric acid but not glucose, suggesting that the acidified environment is sensed by another protein. In addition, the
isogenic mutant could not produce biofilms or activate the
promoter in an acidified environment. Mass spectrometry analysis showed that TrxS regulates M protein, consistent with the transcriptional regulation of
, which encodes M protein. Our results demonstrate that biofilm production during environmental acidification is directly under the control of TrxS.