Abstract
Quorum sensing (QS) enables single-celled bacteria to communicate with chemical signals in order to synchronize group-level bacterial behavior. Pseudoalteromonas are marine bacteria found in versatile environments, of which QS regulation for their habitat adaptation is extremely fragmentary. To distinguish genes required for QS regulation in Pseudoalteromonas, comparative genomics was deployed to define the pan-genomics for twelve isolates and previously-sequenced genomes, of which acyl-homoserine lactone (AHL)-based QS traits were characterized. Additionally, transposon mutagenesis was used to identify the essential QS regulatory genes in the selected Pseudoalteromonas isolate. A remarkable feature showed that AHL-based colorization intensity of biosensors induced by Pseudoalteromonas most likely correlates with QS regulators genetic heterogeneity within the genus. This is supported by the relative expression levels of two of the main QS regulatory genes (luxO and rpoN) analyzed in representative Pseudoalteromonas isolates. Notably, comprehensive QS regulatory schema and the working model proposed in Pseudoalteromonas seem to phylogenetically include the network architectures derived from Escherichia coli, Pseudomonas, and Vibrio. Several associated genes were mapped by transposon mutagenesis. Among them, a right origin-binding protein-encoding gene (robp) was functionally identified as a positive QS regulatory gene. This gene lies on a genomic instable region and exists in the aforementioned bioinformatically recruited QS regulatory schema. The obtained data emphasize that the distinctly- and hierarchically-organized mechanisms probably target QS association in Pseudoalteromonas dynamic genomes, thus leading to bacterial ability to accommodate their adaption fitness and survival advantages.
Highlights
Characterized in 1995, the Pseudoalteromonas genus is ubiquitously present in marine environments, and is able to synthesize broad bioactive chemical molecules [1]
They are greatly versatile bacteria existing in diverse life habitats, as well as on animal and plant tissues, such as Pseudoallteromonas tunicate isolated from the sea lions, Pseudoalteromonas citrea isolated from sponges, and Pseudoalteromonas nigrifaciens isolated from mussels [2,3,4,5]
Characterization of Quorum Sensing Related Colorization Derived from Pseudoalteromonas Isolates
Summary
Characterized in 1995, the Pseudoalteromonas genus is ubiquitously present in marine environments, and is able to synthesize broad bioactive chemical molecules [1]. They are greatly versatile bacteria existing in diverse life habitats, as well as on animal and plant tissues, such as Pseudoallteromonas tunicate isolated from the sea lions, Pseudoalteromonas citrea isolated from sponges, and Pseudoalteromonas nigrifaciens isolated from mussels [2,3,4,5]. The potential fitness of Pseudoalteromonas haloplanktis TAC125 to cold environments was elucidated by genome sequencing [8]. SM9913 and P. haloplanktis TAC125, have illustrated the adaption of Pseudoalteromonas to marine sediment environments as well [10]
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