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Quorum quenching properties of Actinobacteria isolated from Malaysian tropical soils

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Abstract

In this study, a total of 147 soil actinobacterial strains were screened for their ability to inhibit response of Chromobacterium violaceum CV026 to short chain N-acyl homoserine lactone (AHL) which is a quorum sensing molecule. Of these, three actinobacterial strains showed positive for violacein inhibition. We further tested these strains for the inhibition of Pseudomonas aeruginosa PAO1 quorum sensing-regulated phenotypes, namely, swarming and pyocyanin production. The three strains were found to inhibit at least one of the quorum sensing-regulated phenotypes of PAO1. Phylogenetic analysis of the 16S rRNA gene sequences indicated that these strains belong to the genera Micromonospora, Rhodococcus and Streptomyces. This is the first report presenting quorum quenching activity by a species of the genus Micromonospora. Our data suggest that Actinobacteria may be a rich source of active compounds that can act against bacterial quorum sensing system.

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Acknowledgements

The authors gratefully acknowledge the Grants from University of Malaya (High Impact Research Grant: UM.C/625/1/HIR/MOHE/CHAN/01, Grant No. A-000001-50001 and UM-MOHE HIR Grant UM.C/625/1/HIR/MOHE/CHAN/14/1, No. H-50001-A000027 to KGC) and HIR-005.

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Correspondence to Geok Yuan Annie Tan.

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The authors declare that there are no conflicts of interest.

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Communicated by Yusuf Akhter.

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Devaraj, K., Tan, G.Y.A. & Chan, KG. Quorum quenching properties of Actinobacteria isolated from Malaysian tropical soils. Arch Microbiol 199, 897–906 (2017). https://doi.org/10.1007/s00203-017-1371-4

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  • DOI: https://doi.org/10.1007/s00203-017-1371-4

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