Functional analysis of the Pseudomonas aeruginosa autoinducer PAI
10.1128/jb.178.20.5995-6000.1996
Crossref journal-article
American Society for Microbiology
Journal of Bacteriology (235)
Abstract

A series of structural analogs of the Pseudomonas aeruginosa autoinducer [PAI, N-3-oxo-dodecanoyl homoserine lactone] were obtained and tested for their ability to act as autoinducers in stimulating the expression of the gene for elastase (lasB) by measuring beta-galactosidase production from a lasB-lacZ gene fusion in the presence of the transcriptional activator LasR. The data suggest that the length of the acyl side chain of the autoinducer molecule is the most critical factor for activity. Replacement of the ring O by S in the homoserine lactone moiety can be tolerated. Tritium-labelled PAI ([3H]PAI) was synthesized and used to demonstrate the association of [3H]PAI with cells overexpressing LasR. The PAI analogs were also tested for their ability to compete with [3H]PAI for binding of LasR. Results from the competition assays suggest that once again the length of the acyl side chain appears to be crucial for antagonist activity. The presence of the 3-oxo moiety also plays a significant role in binding since analogs which lacked this moiety were much less effective in blocking binding of [3H]PAI. All analogs demonstrating competition with PAI in binding to LasR also exhibited the ability to activate lasB expression, suggesting that they are functional analogs of PAI.

Bibliography

Passador, L., Tucker, K. D., Guertin, K. R., Journet, M. P., Kende, A. S., & Iglewski, B. H. (1996). Functional analysis of the Pseudomonas aeruginosa autoinducer PAI. Journal of Bacteriology, 178(20), 5995–6000.

Authors 6
  1. L Passador (first)
  2. K D Tucker (additional)
  3. K R Guertin (additional)
  4. M P Journet (additional)
  5. A S Kende (additional)
  6. B H Iglewski (additional)
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Dates
Type When
Created 8 years, 9 months ago (Nov. 10, 2016, 8:27 a.m.)
Deposited 4 years, 1 month ago (July 29, 2021, 1:58 p.m.)
Indexed 1 year ago (Sept. 3, 2024, 10:19 a.m.)
Issued 28 years, 11 months ago (Oct. 1, 1996)
Published 28 years, 11 months ago (Oct. 1, 1996)
Published Print 28 years, 11 months ago (Oct. 1, 1996)
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@article{Passador_1996, title={Functional analysis of the Pseudomonas aeruginosa autoinducer PAI}, volume={178}, ISSN={1098-5530}, url={http://dx.doi.org/10.1128/jb.178.20.5995-6000.1996}, DOI={10.1128/jb.178.20.5995-6000.1996}, number={20}, journal={Journal of Bacteriology}, publisher={American Society for Microbiology}, author={Passador, L and Tucker, K D and Guertin, K R and Journet, M P and Kende, A S and Iglewski, B H}, year={1996}, month=oct, pages={5995–6000} }