J Bacteriol Virol.  2020 Jun;50(2):97-106. 10.4167/jbv.2020.50.2.097.

Effects of Exogenous N-Acyl-Homoserine Lactones on Biofilm Formation and Motility in Acinetobacter nosocomialis

  • 1Department of Microbiology and Medical Science, Chungnam National University School of Medicine, Daejeon 35015, Republic of Korea
  • 2Department of Nanobiomedical Science, Dankook University, Cheonan 31116, Republic of Korea


One of the major factors contributing to drug resistance in Acinetobacter nosocomialis infections is biofilm development, which is facilitate by quorum-sensing (QS) systems. Quorum sensing by the LuxI and LuxR homologues, AnoI and AnoR, in A. nosocomialis plays a role in biofilm formation and motility of this pathogenic bacterium. The aim of this study was to evaluate the effects of exogenous N-acyl-homoserine lactones (AHLs) on the regulation of biofilm and motility of A. nosocomialis and anoI-deletion mutant. We found that anoR mRNA expression levels in the anoI-deletion mutant were increased in the presence of different types of AHLs compared with that in the absence of exogenous AHL. Among AHLs, C12-HSL appeared to exert the greatest stimulatory effect on biofilm formation and motility. Notably, the anoI-deletion mutant also exhibited significant decreases in expression of the biofilm- and motility-related genes, csuC, csuD and pilT, decreases that were attenuated by addition of exogenous AHLs. Combining the AHL C12-HSL with C6-HSL or C10-HSL exerted synergistic effects that restored the motility phenotype in the anoI-deletion mutant. Taken together, our data demonstrate that C12-HSL may act as an important signaling molecule in A. nosocomialis through regulation of biofilm formation and cell motility, potentially providing a new target for the control of A. nosocomialis infections.


Quorum sensing; Exogenous AHLs; Biofilm formation; Motility; A. nosocomialis
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