Protecting enzymatic function through directed packaging into bacterial outer membrane vesicles.
Bacteria possess innate machinery to transport extracellular cargo between cells as well as package virulence factors to infect host cells by secreting outer membrane vesicles (OMVs) that contain small molecules, proteins, and genetic material. These robust proteoliposomes have evolved naturally to be resistant to degradation and provide a supportive environment to extend the activity of encapsulated cargo. In this study, we sought to exploit bacterial OMV formation to package and maintain the activity of an enzyme, phosphotriesterase (PTE), under challenging storage conditions encountered for real world applications. Here we show that OMV packaged PTE maintains activity over free PTE when subjected to elevated temperatures (>100-fold more activity after 14 days at 37 °C), iterative freeze-thaw cycles (3.4-fold post four-cycles), and lyophilization (43-fold). We also demonstrate how lyophilized OMV packaged PTE can be utilized as a cell free reagent for long term environmental remediation of pesticide/chemical warfare contaminated areas.
National Research Council, 500 Fifth Street NW (Keck 576), Washington, DC 20001, USA.
Nathan J
NJ
Alves
Center for Bio/Molecular Science &Engineering, US Naval Research Laboratory, Washington, DC 20375, USA.
Kendrick B
KB
Turner
Center for Bio/Molecular Science &Engineering, US Naval Research Laboratory, Washington, DC 20375, USA.
Igor L
IL
Medintz
Center for Bio/Molecular Science &Engineering, US Naval Research Laboratory, Washington, DC 20375, USA.
Scott A
SA
Walper
D001419:Bacteria / Q000201:enzymology* / Q000378:metabolism*; D004795:Enzyme Stability; D000067128:Extracellular Vesicles / Q000201:enzymology*; D005612:Freeze Drying; D044345:Phosphoric Triester Hydrolases / Q000378:metabolism*; D011510:Proteolipids / Q000378:metabolism*; D013696:Temperature; D013997:Time Factors
D011510:Proteolipids; C020485:proteoliposomes; D044345:Phosphoric Triester Hydrolases