27. Exploring Antibiotic Alternatives by Inhibiting Bacterial Quorum Sensing
Aliona Chernish, Cole Shaffer, Dr. Shibani Basu, and Dr. Rajesh Nagarajan
Introduction
Bacteria communicate using small molecules called autoinducers to assess population density in a process called quorum sensing.
Gram-negative bacteria use autoinducers called N-acylhomoserine lactone (AHL) to regulate key physiological activities that include virulence, biofilm formation, and toxin production.
Background
Methods
Inactive probes are synthesized from 1-alkene-3-one and CoA
This product is reacted with the enzyme Sfp to make the final product
N indicates different numbers of carbons; probes with different carbon lengths were synthesized to determine which would bind best with the AHL synthase enzyme EsaI
Results
Fluorescence enhancement monitored how well probes would bind to AHL synthase EsaI
Stern-Volmer Enhancment equation was used to determine quantitative binding affinity (KD)
Discussion
For future work, synthesize probes with 4, 6, 8, 10, and 12 carbons
Test these probes with AHL synthases and determine binding affinity for each enzyme
Compare binding affinity of probes to the native substrate to reveal the which probe has the best binding affinity to each individual AHL synthase.
Acknowledgements
Financial support for this project came from Boise State University start-up funds (RN), NIH 1R15GM117323-01 (RN), NIH INBRE grants P20 RR016454 and P20 GM103408.