Cross-regulatory sRNA networks shape adaptive stress responses in Staphylococcus aureus: RsaC and RsaOI regulate galactose metabolism and cell wall homeostasis

In Staphylococcus aureus, RsaOI and RsaC sRNAs are both induced by acidic pH and vancomycin, and together they are required for surface charge remodeling and subinhibitory vancomycin growth.

• Why it matters: Individual regulators appear dispensable for growth, so the study tests whether stress responses rely on cooperative or redundant cross-regulatory sRNA networks.
• What they did: A yeast one-hybrid screen of 43 transcription factors against seven sRNA promoters found 27 TF–sRNA promoter interactions; VraR and MntR repress srn_9342 while controlling rsaOI and rsaC, respectively.
• The result: RsaOI and RsaC both act on galactose utilization via tagatose pathway genes (lacD for RsaOI; lacC newly identified for RsaC) and modulate virulence factors, with both reducing PSM and protein A changing in opposite directions.

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