Thesis - Open Access
Master of Science (MS)
Biology and Microbiology
ClpXP, E. coli, Persistence, Queueing theory, Synthetic Biology, Tolerance
A major contributing factor to the abundance of antibiotic-resistant microorganisms and failed antibiotic treatment is survival due to antibiotic tolerance and persistence. Antibiotic tolerance is a widespread phenomenon that enables cells to survive treatment without carrying a resistance gene. This phenomenon renders antibiotic treatments less effective and facilitates antibiotic resistance. We are particularly interested in proteases, responsible for degradation of proteins, because of their known relationship to tolerance and persistence. Here, we examine the effects of proteases and antibiotic survival using queueing theory, in which one type of customer competes for processing by servers, that has traditionally been applied to systems such as computer networks and call centers. The biological queueing theory principally assumes that there are limited processing resources in a cell. Using synthetic systems engineered to form proteolytic queues, we can now examine tolerance/persistence in a new manner. In this work, we demonstrated in E. coli that the overproducing of protein engineered to be digested by the protease ClpXP can form a proteolytic queue, and this queue results in an increase in antibiotic tolerance ~80 and ~60 fold with ampicillin and ciprofloxacin, respectively. The proteolytic queue had no apparent effect on bacterial persistence levels. Furthermore, we showed that the queueing at the other two major proteases, ClpAP and Lon, have a slight effect on tolerant cell population.
Number of Pages
South Dakota State University
In Copyright - Educational Use Permitted
Abualrahi, Alawiah, "The Effect of Proteolytic Queues on Antibiotic Tolerance and Persistence Cells Population in Escherichia Coli" (2019). Electronic Theses and Dissertations. 3656.