Chitinivorax:The New Kid on the Block of Bacterial2‑Alkyl-4(1<i>H</i>)‑quinolone Producers

2-Alkyl-4(1<i>H</i>)-quinolones play a key role in bacterial communication, regulating biofilm formation, and virulence. Their antimicrobial properties also support bacterial survival and interspecies competition in microbial communities. In addition to the human pathogen Pseudomonas aeruginosa various species of <i>Burkholderia</i> and <i>Pseudoalteromonas</i> are known to produce 2-alkyl-4(1<i>H</i>)-quinolones. However, the evolutionary relationships of their biosynthetic gene clusters remain largely unexplored. To address this, we investigated the phylogeny of 2-alkyl-4(1<i>H</i>)-quinolone biosynthetic gene clusters, leading to the discovery of <i>Chitinivorax</i> as a fourth genus capable of producing 2-alkyl-4(1<i>H</i>)-quinolones, expanding our knowledge of the diversity of bacteria involved in quinolone-biosynthesis.