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Legionellosis is mostly caused by  Legionella pneumophila  ( Lp ) and is defined by a severe respiratory illness with a case fatality rate ranging from 5 to 80%. In a previous study, we showed that a glycosaminoglycan (GAG)-binding adhesin of  Lp , named Lcl, is produced during legionellosis and is unique to the  L. pneumophila  species. Importantly, a mutant depleted in Lcl ( Δlpg2644 ) is impaired in adhesion to GAGs and epithelial cells and in biofilm formation. Here, we examine the molecular function(s) of Lcl and the transcriptional regulation of its encoding gene during different stages of the biofilm development. We show that the collagen repeats and the  C -terminal domains of Lcl are crucial for the production of biofilm. We present evidence that Lcl is involved in the early step of surface attachment but also in intercellular interactions. Furthermore, we address the relationship between Lcl gene regulation during biofilm formation and quorum sensing (QS). In a static biofilm assay, we show that Lcl is differentially regulated during growth phases and biofilm formation. Moreover, we show that the transcriptional regulation of  lpg2644,  mediated by a prototype of QS signaling homoserine lactone (3OC12-HSL), may play a role during the biofilm development. Thus, transcriptional down-regulation of  lpg2644  may facilitate the dispersion of Lp to reinitiate biofilm colonization on a distal surface.

Essential Roles and Regulation of the Legionella pneumophila Collagen-Like Adhesin during Biofilm Formation