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Here we show that synthetic <jats:styled-content style=\"fixed-case\">LAI<\/jats:styled-content>\u20101 promotes the motility of <jats:styled-content style=\"fixed-case\"><jats:italic>L<\/jats:italic><\/jats:styled-content><jats:italic>. pneumophila<\/jats:italic> by signalling through <jats:styled-content style=\"fixed-case\">LqsS<\/jats:styled-content>\/<jats:styled-content style=\"fixed-case\">LqsT<\/jats:styled-content> and <jats:styled-content style=\"fixed-case\">LqsR<\/jats:styled-content>. Upon addition of <jats:styled-content style=\"fixed-case\">LAI<\/jats:styled-content>\u20101, autophosphorylation of <jats:styled-content style=\"fixed-case\">LqsS<\/jats:styled-content>\/<jats:styled-content style=\"fixed-case\">LqsT<\/jats:styled-content> by [\u03b3\u2010<jats:sup>32<\/jats:sup><jats:styled-content style=\"fixed-case\">P<\/jats:styled-content>]\u2010<jats:styled-content style=\"fixed-case\">ATP<\/jats:styled-content> was inhibited in a dose\u2010dependent manner. In contrast, the <jats:styled-content style=\"fixed-case\"><jats:italic>V<\/jats:italic><\/jats:styled-content><jats:italic>ibrio cholerae<\/jats:italic> autoinducer <jats:styled-content style=\"fixed-case\">CAI<\/jats:styled-content>\u20101 (3\u2010hydroxytridecane\u20104\u2010one) promoted the phosphorylation of <jats:styled-content style=\"fixed-case\">LqsS<\/jats:styled-content> (but not <jats:styled-content style=\"fixed-case\">LqsT<\/jats:styled-content>). <jats:styled-content style=\"fixed-case\">LAI<\/jats:styled-content>\u20101 did neither affect the stability of phospho\u2010<jats:styled-content style=\"fixed-case\">LqsS<\/jats:styled-content> or phospho\u2010<jats:styled-content style=\"fixed-case\">LqsT<\/jats:styled-content>, nor the dephosphorylation by <jats:styled-content style=\"fixed-case\">LqsR<\/jats:styled-content>. Transcriptome analysis of <jats:styled-content style=\"fixed-case\"><jats:italic>L<\/jats:italic><\/jats:styled-content><jats:italic>. pneumophila<\/jats:italic> treated with <jats:styled-content style=\"fixed-case\">LAI<\/jats:styled-content>\u20101 revealed that the compound positively regulates a number of genes, including the non\u2010coding <jats:styled-content style=\"fixed-case\">RNAs<\/jats:styled-content>\u2005<jats:italic>rsm<\/jats:italic><jats:styled-content style=\"fixed-case\"><jats:italic>Y<\/jats:italic><\/jats:styled-content> and <jats:italic>rsm<\/jats:italic><jats:styled-content style=\"fixed-case\"><jats:italic>Z<\/jats:italic><\/jats:styled-content>, and negatively regulates the <jats:styled-content style=\"fixed-case\">RNA<\/jats:styled-content>\u2010binding global regulator <jats:italic>crs<\/jats:italic><jats:styled-content style=\"fixed-case\"><jats:italic>A<\/jats:italic><\/jats:styled-content>. Accordingly, <jats:styled-content style=\"fixed-case\">LAI<\/jats:styled-content>\u20101 controls the switch from the replicative to the transmissive growth phase of <jats:styled-content style=\"fixed-case\"><jats:italic>L<\/jats:italic><\/jats:styled-content><jats:italic>. pneumophila<\/jats:italic>. In summary, the findings indicate that <jats:styled-content style=\"fixed-case\">LAI<\/jats:styled-content>\u20101 regulates motility and the biphasic life style of <jats:styled-content style=\"fixed-case\"><jats:italic>L<\/jats:italic><\/jats:styled-content><jats:italic>. pneumophila<\/jats:italic> through <jats:styled-content style=\"fixed-case\">LqsS<\/jats:styled-content>\u2010 and <jats:styled-content style=\"fixed-case\">LqsT<\/jats:styled-content>\u2010dependent phosphorylation signalling.<\/jats:p>","DOI":"10.1111\/mmi.13265","type":"journal-article","created":{"date-parts":[[2015,11,5]],"date-time":"2015-11-05T08:06:41Z","timestamp":1446710801000},"page":"778-793","source":"Crossref","is-referenced-by-count":46,"title":["The \u03b1\u2010hydroxyketone LAI\u20101 regulates motility, Lqs\u2010dependent phosphorylation signalling and gene expression of <i>Legionella 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