Abstract
ABSTRACT Many gram-negative bacteria synthesize N -acyl homoserine lactone autoinducer molecules as quorum-sensing signals which act as cell density-dependent regulators of gene expression. We have investigated the in vivo source of the acyl chain and homoserine lactone components of the autoinducer synthesized by the LuxI homolog, TraI. In Escherichia coli , synthesis of N -(3-oxooctanoyl)homoserine lactone by TraI was unaffected in a fadD mutant blocked in β-oxidative fatty acid degradation. Also, conditions known to induce the fad regulon did not increase autoinducer synthesis. In contrast, cerulenin and diazoborine, specific inhibitors of fatty acid synthesis, both blocked autoinducer synthesis even in a strain dependent on β-oxidative fatty acid degradation for growth. These data provide the first in vivo evidence that the acyl chains in autoinducers synthesized by LuxI-family synthases are derived from acyl-acyl carrier protein substrates rather than acyl coenzyme A substrates. Also, we show that decreased levels of intracellular S -adenosylmethionine caused by expression of bacteriophage T3 S -adenosylmethionine hydrolase result in a marked reduction in autoinducer synthesis, thus providing direct in vivo evidence that the homoserine lactone ring of LuxI-family autoinducers is derived from S -adenosylmethionine.
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Dates
Type | When |
---|---|
Created | 5 years, 8 months ago (Dec. 31, 2019, 11:23 a.m.) |
Deposited | 4 years, 1 month ago (July 29, 2021, 2:20 p.m.) |
Indexed | 3 months, 2 weeks ago (May 21, 2025, 9:29 a.m.) |
Issued | 27 years, 3 months ago (May 15, 1998) |
Published | 27 years, 3 months ago (May 15, 1998) |
Published Print | 27 years, 3 months ago (May 15, 1998) |
@article{Val_1998, title={In Vivo Evidence that S -Adenosylmethionine and Fatty Acid Synthesis Intermediates Are the Substrates for the LuxI Family of Autoinducer Synthases}, volume={180}, ISSN={1098-5530}, url={http://dx.doi.org/10.1128/jb.180.10.2644-2651.1998}, DOI={10.1128/jb.180.10.2644-2651.1998}, number={10}, journal={Journal of Bacteriology}, publisher={American Society for Microbiology}, author={Val, Dale L. and Cronan, John E.}, year={1998}, month=may, pages={2644–2651} }