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Abstract

Many saprophytic bacteria have LuxR-I-type acyl-homoserine lactone (AHL) quorum-sensing systems that may be important for competing with other bacteria in complex soil communities. LuxR AHL receptors specifically interact with cognate AHLs to cause changes in expression of target genes. Some LuxR-type AHL receptors have relaxed specificity and are responsive to non-cognate AHLs. These promiscuous receptors might be used to sense and respond to AHLs produced by other bacteria by eavesdropping. We are interested in understanding the role of eavesdropping during interspecies competition. The soil saprophyte has a single AHL circuit, CviR-I, which produces and responds to hexanoyl-HSL (C6-HSL). The AHL receptor CviR can respond to a variety of AHLs in addition to C6-HSL. In prior studies we have utilized a coculture model with and another soil saprophyte, . Using this model, we previously showed that promiscuous activation of CviR by AHLs provides a competitive advantage to . Here, we show that AHLs activate transcription of dozens of genes in including the genes coding for production of hydrogen cyanide. We show that hydrogen cyanide production is population density-dependent and demonstrate that the cross-induction of hydrogen cyanide by AHLs provides a competitive advantage to . Our results provide new information on quorum sensing and are the basis for future studies aimed at understanding the role of eavesdropping in interspecies competition.

Funding
This study was supported by the:
  • National Institute of General Medical Sciences (Award P20GM113117)
    • Principle Award Recipient: NotApplicable
  • National Institute of General Medical Sciences (Award P20GM103638)
    • Principle Award Recipient: NotApplicable
  • National Institute of General Medical Sciences (Award P20GM103418)
    • Principle Award Recipient: SaidaBenomar
  • National Institute of General Medical Sciences (Award T32 GM08545)
    • Principle Award Recipient: KaraC Evans
  • National Institute of General Medical Sciences (Award R35GM133572)
    • Principle Award Recipient: JosephineR Chandler
  • This is an open-access article distributed under the terms of the Creative Commons Attribution License.
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2023-02-15
2024-05-04
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