| Title: | Bright mutants of Vibrio fischeri ES114 reveal conditions and regulators that control bioluminescence and expression of the lux operon |
| Author(s): | Lyell NL; Dunn AK; Bose JL; Stabb EV; |
| Address: | "Department of Microbiology, University of Georgia, 1000 Cedar Street, Athens, GA 30602, USA" |
| ISSN/ISBN: | 1098-5530 (Electronic) 0021-9193 (Print) 0021-9193 (Linking) |
| Abstract: | "Vibrio fischeri ES114, an isolate from the Euprymna scolopes light organ, produces little bioluminescence in culture but is approximately 1,000-fold brighter when colonizing the host. Cell-density-dependent regulation alone cannot explain this phenomenon, because cells within colonies on solid medium are much dimmer than symbiotic cells despite their similar cell densities. To better understand this low luminescence in culture, we screened approximately 20,000 mini-Tn5 mutants of ES114 for increased luminescence and identified 28 independent 'luminescence-up' mutants with insertions in 14 loci. Mutations affecting the Pst phosphate uptake system led to the discovery that luminescence is upregulated under low-phosphate conditions by PhoB, and we also found that ainS, which encodes an autoinducer synthase, mediates repression of luminescence during growth on plates. Other novel luminescence-up mutants had insertions in acnB, topA, tfoY, phoQ, guaB, and two specific tRNA genes. Two loci, hns and lonA, were previously described as repressors of bioluminescence in transgenic Escherichia coli carrying the light-generating lux genes, and mutations in arcA and arcB were consistent with our report that Arc represses lux. Our results reveal a complex regulatory web governing luminescence and show how certain environmental conditions are integrated into regulation of the pheromone-dependent lux system" |
| Keywords: | "Aliivibrio fischeri/genetics/*metabolism Bacterial Proteins/genetics/*metabolism DNA Transposable Elements/genetics/physiology Genetic Complementation Test Guanine/metabolism *Luminescence Magnesium/metabolism Models, Biological Mutation/genetics Operon/g;" |
| Notes: | "MedlineLyell, Noreen L Dunn, Anne K Bose, Jeffrey L Stabb, Eric V eng R01 AI050661/AI/NIAID NIH HHS/ R37 AI050661/AI/NIAID NIH HHS/ Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 2010/08/10 J Bacteriol. 2010 Oct; 192(19):5103-14. doi: 10.1128/JB.00524-10. Epub 2010 Aug 6" |
