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Synthesis and Assay of Vibrio Quorum Sensing Inhibitors
03:29

Synthesis and Assay of Vibrio Quorum Sensing Inhibitors

Published on: May 31, 2024

Transition state analogs of 5'-methylthioadenosine nucleosidase disrupt quorum sensing

Jemy A Gutierrez1, Tamara Crowder, Agnes Rinaldo-Matthis

  • 1Department of Biochemistry, Albert Einstein College of Medicine, Bronx, New York, USA.

Nature Chemical Biology
|March 10, 2009
PubMed

Insights

New inhibitors target bacterial 5'-Methylthioadenosine/S-adenosylhomocysteine nucleosidase (MTAN), disrupting quorum sensing and virulence. These compounds show potential for developing novel anti-infective drugs against pathogens like Vibrio cholerae and E. coli.

Area of Science:

  • Biochemistry
  • Microbiology
  • Drug Discovery

Background:

  • 5'-Methylthioadenosine/S-adenosylhomocysteine nucleosidase (MTAN) is crucial in bacterial S-adenosylmethionine metabolism and quorum sensing.
  • Quorum sensing regulates bacterial pathogenesis, making MTAN a potential drug target.

Purpose of the Study:

  • To investigate the inhibitory potential of transition state analogs against bacterial MTAN.
  • To evaluate the efficacy of these inhibitors in disrupting quorum sensing and virulence in pathogenic bacteria.

Main Methods:

  • Synthesis and characterization of transition state analogs (MT-DADMe-Immucillin-A, EtT-DADMe-Immucillin-A, BuT-DADMe-Immucillin-A).
  • Enzyme inhibition assays against Vibrio cholerae MTAN (VcMTAN).
  • Cell-based assays in V. cholerae and E. coli O157:H7 to assess autoinducer production, growth, and biofilm formation.

Main Results:

  • Transition state analogs demonstrated potent, slow-onset, tight-binding inhibition of VcMTAN (pM to nM IC50 values).
  • Inhibition of autoinducer production in V. cholerae and E. coli O157:H7 was observed in a dose-dependent manner.
  • BuT-DADMe-Immucillin-A significantly reduced biofilm formation and effects persisted across generations.

Conclusions:

  • MTAN is a validated target for inhibiting bacterial quorum sensing.
  • The developed transition state analogs are promising leads for novel anti-infective drug development.
  • Targeting MTAN offers a strategy to combat bacterial infections by disrupting virulence mechanisms.

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