8dq1
Quorum-sensing receptor RhlR bound to PqsE
Structural highlights
FunctionRHLR_PSEAE Quorum-sensing regulator that controls the expression of multiple virulence factors in response to extracellular signaling molecules called autoinducers (PubMed:15576196, PubMed:7494482, PubMed:8522523). Involved, among others, in the transcriptional regulation of genes that are responsible for rhamnolipid surfactant biosynthesis (PubMed:14526008, PubMed:7604006, PubMed:8144472). Acts by binding to a specific sequence in the rhlAB regulatory region, both in the presence and in the absence of its autoinducer (PubMed:14526008). In the former case it activates transcription of the promoter, whereas in the latter it acts as a transcriptional repressor (PubMed:14526008). Also regulates the expression of the rmlBDAC operon, encoding dTDP-L-rhamnose biosynthetic enzymes, by binding to the rml box in the promoter region (PubMed:22262098). In addition, is involved in the regulation of the production of elastase (lasB) and pyocyanine (PubMed:7604006, PubMed:8144472, PubMed:8522523).[1] [2] [3] [4] [5] [6] [7] Publication Abstract from PubMedPseudomonas aeruginosa is an opportunistic pathogen that is responsible for thousands of deaths every year in the United States. P. aeruginosa virulence factor production is mediated by quorum sensing, a mechanism of bacterial cell-cell communication that relies on the production and detection of signal molecules called autoinducers. In P. aeruginosa, the transcription factor receptor RhlR is activated by a RhlI-synthesized autoinducer. We recently showed that RhlR-dependent transcription is enhanced by a physical interaction with the enzyme PqsE via increased affinity of RhlR for promoter DNA. However, the molecular basis for complex formation and how complex formation enhanced RhlR transcriptional activity remained unclear. Here, we report the structure of ligand-bound RhlR in complex with PqsE. Additionally, we determined the structure of the complex bound with DNA, revealing the mechanism by which RhlR-mediated transcription is enhanced by PqsE, thereby establishing the molecular basis for RhlR-dependent virulence factor production in P. aeruginosa. Structure of the RhlR-PqsE complex from Pseudomonas aeruginosa reveals mechanistic insights into quorum-sensing gene regulation.,Feathers JR, Richael EK, Simanek KA, Fromme JC, Paczkowski JE Structure. 2022 Dec 1;30(12):1626-1636.e4. doi: 10.1016/j.str.2022.10.008. Epub , 2022 Nov 14. PMID:36379213[8] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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