<b>Quorum sensing regulatory protein LsrR affects Avian Pathogenic </b><b><i>Escherichia coli </i></b><b>pathogenicity by regulating </b><b><i>cysN</i></b>

The study determined that the <i>cysN</i> gene influences<i> </i>biofilm formation, motility, adhesion, invasion, bacterial persistence, antibiotic susceptibility, and minimum inhibition concentration. Further, the results revealed that LsrR binds to a region -289 to -319 of the <i>cysN</i> promoter. The most intriguing discovery of this study is that <i>cysN</i> contributes to APEC survival efficiency and pathogenicity. Future research studies should explore additional quorum sensing pathways, mechanistic studies on binding affinities, <i>cysN</i> role in multi-drug resistance, and immune modulation mechanisms