Kinetic studies on the expression of alginate and extracellular proteins by pseudomonas aeruginosa frd1 and pao1
Pseudomonas aeruginosa is characterized by its capability to produce extracellular virulence proteins and to establish biofilm-based infections that do not respond easily to conventional treatments. How-ever, the physiological conditions that decrease the fitness of such a persistent pathogen would assist the host to defend itself and reduce the infection prevalence. Therefore, developing treatments against P. aeruginosa requires a quantitative understanding of the relationship between bacterial growth kinetics and secretion of alginate and pro-teins, in addition to the ecological factors that control their synthesis. For this purpose, we examined various environmental factors that affect the specific product yield coefficients (expressed as g prod-uct/OD600) of alginate and extracellular proteins using a mucoid (FRD1) and a non-mucoid (PAO1) clinical isolate of P. aeruginosa, respectively. The results suggested magnesium sulfate, trace elements and hydrogen peroxide as significant variables that positively affect alginate synthesis by the FRD1 cells. However, the production of extracellular proteins by PAO1 was negatively affected by the con-centration of ferrous sulfate. For understanding the kinetics of expressing alginate and extracellular proteins by the cells, a well-controlled 5 L tank bioreactor was used. The results suggested that under the bioreactor controlled conditions, both alginate and extracellular proteins are expressed parallel to biomass increase in the cells of P. aeruginosa.
Faculty of Dentistry
Life Sciences, General Immunology and Microbiology
Indexed in Scopus
Indexed in Web Of Science
Alginate, Extracellular polymeric substances (EPS), Extracellular proteins, Kinetics, Polysaccharides, Pseu-domonas aeruginosa
El-Helow, Ehab R.; Atalla, Ramy G.; Sabra, Wael A.; and Lotfy, Walid A., "Kinetic studies on the expression of alginate and extracellular proteins by pseudomonas aeruginosa frd1 and pao1" (2020). Faculty of Dentistry. 37.