Roles of quorum sensing molecules from Rhizobium etli RT1 in bacterial motility and biofilm formation

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Abstract

Strain RT1 was isolated from root nodules of Lens culinaris (a lentil) and characterized as Rhizobium etli (a Gram-negative soil-borne bacterium) by 16S rDNA sequencing and phylogenetic analysis. The signaling molecules produced by R. etli (RT1) were detected and identified by high-performance liquid chromatography coupled with mass spectrometry. The most abundant and biologically active N-acyl homoserine lactone molecules (3-oxo-C 8 -HSL and 3-OH-C 14 -HSL) were detected in the ethyl acetate extract of RT1. The biological role of 3-oxo-C 8 -HSL was evaluated in RT1. Bacterial motility and biofilm formation were affected or modified on increasing concentrations of 3-oxo-C 8 -HSL. Results confirmed the existence of cell communication in RT1 mediated by 3-oxo-C 8 -HSL, and positive correlations were found among quorum sensing, motility and biofilm formation in RT1.

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Dixit, S., Dubey, R. C., Maheshwari, D. K., Seth, P. K., & Bajpai, V. K. (2017). Roles of quorum sensing molecules from Rhizobium etli RT1 in bacterial motility and biofilm formation. Brazilian Journal of Microbiology, 48(4), 815–821. https://doi.org/10.1016/j.bjm.2016.08.005

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