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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 <jats:italic>Chromobacterium subtsugae<\/jats:italic> has a single AHL circuit, CviR-I, which produces and responds to <jats:italic>N-<\/jats:italic>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 <jats:italic>C. subtsugae<\/jats:italic> and another soil saprophyte, <jats:italic>Burkholderia thailandensis<\/jats:italic>. Using this model, we previously showed that promiscuous activation of CviR by <jats:italic>B. thailandensis<\/jats:italic> AHLs provides a competitive advantage to <jats:italic>C. subtsugae<\/jats:italic>. Here, we show that <jats:italic>B. thailandensis<\/jats:italic> AHLs activate transcription of dozens of genes in <jats:italic>C. subtsugae,<\/jats:italic> including the <jats:italic>hcnABC<\/jats:italic> 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 <jats:italic>B. thailandensis<\/jats:italic> AHLs provides a competitive advantage to <jats:italic>C. subtsugae<\/jats:italic>. Our results provide new information on <jats:italic>C. subtsugae<\/jats:italic> quorum sensing and are the basis for future studies aimed at understanding the role of eavesdropping in interspecies competition.<\/jats:p>","DOI":"10.1099\/mic.0.001294","type":"journal-article","created":{"date-parts":[[2023,2,15]],"date-time":"2023-02-15T15:16:39Z","timestamp":1676474199000},"source":"Crossref","is-referenced-by-count":8,"title":["Cross-species activation of hydrogen cyanide production by a promiscuous quorum-sensing receptor promotes Chromobacterium subtsugae competition in a dual-species model"],"prefix":"10.1099","volume":"169","author":[{"given":"Cheyenne","family":"Loo","sequence":"first","affiliation":[{"name":"Present address: Stowers Institute for Medical Research, Kansas City, MO 64110, USA"},{"name":"Department of Molecular Biosciences, University of Kansas, Lawrence, KS 66045, 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