Solubility and Bioactivity of the Pseudomonas Quinolone Signal Are Increased by a Pseudomonas aeruginosa-Produced Surfactant
Author
Calfee, M. Worth; Shelton, John G.; McCubrey, James A.; Pesci, Everett C.
Abstract
Pseudomonas aeruginosa is a gram-negative bacterium that causes serious infections in immunocompromised individuals and cystic fibrosis patients. This opportunistic pathogen controls many of its virulence factors and cellular functions through the activity of three cell-to-cell signals, N-(3-oxododecanoyl)-L-homoserine lactone, N-butyryl-L-homoserine lactone, and the Pseudomonas quinolone signal (PQS). The activity of these signals is dependent upon their ability to dissolve in and freely diffuse through the aqueous solution in which P. aeruginosa happens to reside. Despite this, our data indicated that PQS was relatively insoluble in aqueous solutions, which led us to postulate that P. aeruginosa could be producing a PQS-solubilizing factor. In this report, we show that the P. aeruginosa-produced biosurfactant rhamnolipid greatly enhances the solubility of PQS in aqueous solutions. The enhanced solubility of PQS led to an increase in PQS bioactivity, as measured by both a gene induction assay and an apoptosis assay. This is the first demonstration of the importance of a bacterial surfactant in the solubilization and bioactivity of a cell-to-cell signal. Originally published Infection and Immunity, Vol. 73, No. 2, Feb 2005
Date
2005-02
Citation:
APA:
Calfee, M. Worth, & Shelton, John G., & McCubrey, James A., & Pesci, Everett C.. (February 2005).
Solubility and Bioactivity of the Pseudomonas Quinolone Signal Are Increased by a Pseudomonas aeruginosa-Produced Surfactant.
Infection and Immunity,
73(2),
878-
882. Retrieved from
http://hdl.handle.net/10342/3242
MLA:
Calfee, M. Worth, and Shelton, John G., and McCubrey, James A., and Pesci, Everett C..
"Solubility and Bioactivity of the Pseudomonas Quinolone Signal Are Increased by a Pseudomonas aeruginosa-Produced Surfactant". Infection and Immunity.
73:2. (878-882),
February 2005.
October 03, 2023.
http://hdl.handle.net/10342/3242.
Chicago:
Calfee, M. Worth and Shelton, John G. and McCubrey, James A. and Pesci, Everett C.,
"Solubility and Bioactivity of the Pseudomonas Quinolone Signal Are Increased by a Pseudomonas aeruginosa-Produced Surfactant," Infection and Immunity 73, no.
2 (February 2005),
http://hdl.handle.net/10342/3242 (accessed
October 03, 2023).
AMA:
Calfee, M. Worth, Shelton, John G., McCubrey, James A., Pesci, Everett C..
Solubility and Bioactivity of the Pseudomonas Quinolone Signal Are Increased by a Pseudomonas aeruginosa-Produced Surfactant. Infection and Immunity.
February 2005;
73(2):
878-882.
http://hdl.handle.net/10342/3242. Accessed
October 03, 2023.
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Publisher
East Carolina University