Through the first grant, researchers at the Department of Energy's Pacific Northwest National Laboratory will develop a model of the cell wall of the bacterium P. aeruginosa in hopes of discovering how the membranes and proteins excrete antibiotics.
P. aeruginosa takes advantage of a genetic defect in cystic fibrosis patients that changes the function of proteins in the membrane of cells in the lungs, allowing the formation of a biofilm that interferes with normal lung function.
Bacteria are living cells and some such as P. aeruginosa have an inner and outer membrane, each containing proteins. PNNL researchers will create a computer model of the cell wall, its embedded proteins and their functions. The outer membrane will be under particular scrutiny because it interacts directly with the cell's environment and controls the transport of nutrients and other molecules, such as antibiotics, into the cell.
The PNNL research team will study the transport of small molecules through proteins in the outer membrane in order to provide an understanding of the underlying mechanisms. Researchers will also examine which factors are important in the resistance of P. aeruginosa for antibiotics designed to disrupt the outer membrane, giving insight into why P. aeruginosa is elusive to treatment.
The structures of the outer membrane proteins of P. aeruginosa will be modeled after similar proteins taken from Escherichia coli, for which experimental crystal structures are
Contact: Andrea Turner
DOE/Pacific Northwest National Laboratory