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      A comparative study of non-native N -acyl l -homoserine lactone analogs in two Pseudomonas aeruginosa quorum sensing receptors that share a common native ligand yet inversely regulate virulence

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      Bioorganic & Medicinal Chemistry

      Elsevier BV

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          Abstract

          <p class="first" id="P1">Certain bacteria can coordinate group behaviors via a chemical communication system known as quorum sensing (QS). Gram-negative bacteria typically use <i>N</i>-acyl L-homoserine lactone (AHL) signals and their cognate intracellular LuxR-type receptors for QS. The opportunistic pathogen <i>Pseudomonas aeruginosa</i> has a relatively complex QS circuit in which two of its LuxR-type receptors, LasR and QscR, are activated by the same natural signal, <i>N</i>-(3-oxo)-dodecanoyl L-homoserine lactone. Intriguingly, once active, LasR activates virulence pathways in <i>P. aeruginosa</i>, while activated QscR can inactivate LasR and thus repress virulence. We have a limited understanding of the structural features of AHLs that engender either agonistic activity in both receptors or receptor-selective activity. Compounds with the latter active profile could prove especially useful tools to tease out the roles of these two receptors in virulence regulation. A small collection of AHL analogues was assembled and screened in cell-based reporter assays for activity in both LasR and QscR. We identified several structural motifs that bias ligand activation towards each of the two receptors. These findings will inform the development of new synthetic ligands for LasR and QscR with improved potencies and selectivities. </p><p id="P2"> <div class="figure-container so-text-align-c"> <img alt="" class="figure" src="/document_file/c8755ef8-a031-4ce6-87a9-dd2654f8a8cc/PubMedCentral/image/nihms969800u1.jpg"/> </div> </p>

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          Author and article information

          Journal
          Bioorganic & Medicinal Chemistry
          Bioorganic & Medicinal Chemistry
          Elsevier BV
          09680896
          May 2018
          May 2018
          Article
          10.1016/j.bmc.2018.05.018
          6234094
          29793752
          4539fdf7-dd54-45c4-b1db-070239208013
          © 2018

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