In quorum sensing genes of Gammaproteobacteria, which includes Pseudomonas aeruginosa and Escherichia coli, the LuxI/LuxR genes form a functional pair, with LuxI as the auto-inducer synthase and LuxR as the receptor. Gammaproteobacteria are unique in possessing quorum sensing genes, which, although functionally similar to the LuxI/LuxR genes, have a markedly divergent sequence. This family of quorum-sensing homologs may have arisen in the Gammaproteobacteria ancestor, although the cause of their extreme sequence divergence yet maintenance of functional similarity has yet to be explained. In addition, species that employ multiple discrete quorum sensing systems are almost all members of the Gammaproteobacteria, and evidence of horizontal transfer of quorum sensing genes is most evident in this class.
in quorum sensing genes of gammaproteobacteria which includes pseudomonas aeruginosa and escherichia coli the luxi/luxr genes form a functional pair with luxi as the auto-inducer synthase and luxr as the receptor gammaproteobacteria are unique in possessing quorum sensing genes which although functionally similar to the luxi/luxr genes have a markedly divergent sequence this family of quorum-sensing homologs may have arisen in the gammaproteobacteria ancestor although the cause of their extreme sequence divergence yet maintenance of functional similarity has yet to be explained in addition species that employ multiple discrete quorum sensing systems are almost all members of the gammaproteobacteria and evidence of horizontal transfer of quorum sensing genes is most evident in this class