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Microbiology Society logo Microbiology

Volume 155, Issue 12

AI-2 quorum-sensing inhibitors affect the starvation response and reduce virulence in several species, most likely by interfering with LuxPQ Free

Abstract

The increase of disease outbreaks caused by species in aquatic organisms as well as in humans, together with the emergence of antibiotic resistance in species, has led to a growing interest in alternative disease control measures. Quorum sensing (QS) is a mechanism for regulating microbial gene expression in a cell density-dependent way. While there is good evidence for the involvement of auto-inducer 2 (AI-2)-based interspecies QS in the control of virulence in multiple species, only few inhibitors of this system are known. From the screening of a small panel of nucleoside analogues for their ability to disturb AI-2-based QS, an adenosine derivative with a -methoxyphenylpropionamide moiety at C-3′ emerged as a promising hit. Its mechanism of inhibition was elucidated by measuring the effect on bioluminescence in a series of AI-2 QS mutants. Our results indicate that this compound, as well as a truncated analogue lacking the adenine base, block AI-2-based QS without interfering with bacterial growth. The active compounds affected neither the bioluminescence system as such nor the production of AI-2, but most likely interfered with the signal transduction pathway at the level of LuxPQ in . The most active nucleoside analogue (designated LMC-21) was found to reduce the species starvation response, to affect biofilm formation in , and , to reduce pigment and protease production in , and to protect gnotobiotic from -induced mortality.

  • Received:
  • Accepted:
  • Revised:
  • Published Online:
Keyword(s): AI-2, auto-inducer 2 , CV, crystal violet , DPD, 4,5-dihydroxy-2,3-pentanedione , MCPBA, 4-methoxycarbonyl-phenylboronic acid , QS, quorum sensing and QSI, QS inhibiting
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2009-12-01
2025-12-12

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/content/journal/micro/10.1099/mic.0.032474-0
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AI-2 quorum-sensing inhibitors affect the starvation response and reduce virulence in several Vibrio species, most likely by interfering with LuxPQ
Microbiology 155, 4114 (2009); https://doi.org/10.1099/mic.0.032474-0
/content/journal/micro/10.1099/mic.0.032474-0
/content/journal/micro/10.1099/mic.0.032474-0
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