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While a functional quorum sensing system has been identified in the acidophilic chemolithoautotrophic  Acidithiobacillus ferrooxidans  ATCC 23270 T  and shown to modulate cell adhesion to solid substrates, nothing is known about the genes it regulates. To address the question of how quorum sensing controls biofilm formation in  A .  ferrooxidans  T , the transcriptome of this organism in conditions in which quorum sensing response is stimulated by a synthetic superagonist AHL (N-acyl homoserine lactones) analog has been studied. First, the effect on biofilm formation of a synthetic AHL tetrazolic analog, tetrazole  9c , known for its agonistic QS activity, was assessed by fluorescence and electron microscopy. A fast adherence of  A. ferrooxidans  T  cells on sulfur coupons was observed. Then, tetrazole  9c  was used in DNA microarray experiments that allowed the identification of genes regulated by quorum sensing signaling, and more particularly, those involved in early biofilm formation. Interestingly,  afeI  gene, encoding the AHL synthase, but not the  A. ferrooxidans  quorum sensing transcriptional regulator AfeR encoding gene, was shown to be regulated by quorum sensing. Data indicated that quorum sensing network represents at least 4.5% (141 genes) of the ATCC 23270 T  genome of which 42.5% (60 genes) are related to biofilm formation. Finally, AfeR was shown to bind specifically to the regulatory region of the  afeI  gene at the level of the palindromic sequence predicted to be the AfeR binding site. Our results give new insights on the response of  A. ferrooxidans  to quorum sensing and on biofilm biogenesis.

frontiers in microbiology

Insights into the Quorum Sensing Regulon of the Acidophilic Acidithiobacillus ferrooxidans Revealed by Transcriptomic in the Presence of an Acyl Homoserine Lactone Superagonist Analog