3.5.1.97 H278S site-directed mutagenesis, the mutant shows 80% reduced activity compared to wild-type -, 757621 3.5.1.97 L279S site-directed mutagenesis, the mutant shows 74% reduced activity compared to wild-type -, 757621 3.5.1.97 additional information AHL-mediated virulence factor production in a plant pathogen, Pectobacterium carotovorum, is dramatically attenuated by coculture with MacQ-overexpressing Escherichia coli Origami 2(DE3), whereas Escherichia coli with an empty vector is unable to quench the pathogenicity 755847 3.5.1.97 additional information random transposon mutagenesis, screening of the resulting mutants for the loss of AHL acylase activity. The Tn insertion in mutant A6731 is mapped to a gene termed aiiO -, 714841 3.5.1.97 additional information the strain PAO1-DELTApvd is shown to be more virulent than the wild-type strain, confirming the role of PvdQ as a virulence-reducing agent 710886