Immobilization of active human carboxylesterase 1 in biomimetic silica nanoparticles

Jonathan S. Edwards, Amar Kumbhar, Adam Roberts, Andrew C. Hemmert, Carol C. Edwards, Philip M. Potter, Matthew R. Redinbo
2011 Biotechnology progress (Print)  
The encapsulation of proteins in biomimetic silica has recently been shown to successfully maintain enzymes in their active state. Organophosphate (OP) compounds are employed as pesticides as well as potent chemical warfare nerve agents. Because these toxicants are life threatening, we sought to generate biomimetic silicas capable of responding to OPs. Here, we present the silica encapsulation of human drug metabolism enzyme carboxylesterase 1 (hCE1) in the presence of a range of catalysts.
more » ... was successfully encapsulated into silica particles when lysozyme or the peptide R5 were used as catalysts; in contrast, polyethyleneimine (PEI), a catalyst employed to encapuslate other enzymes, did not facilitate hCE1 entrapment. hCE1 silica particles in a column chromatography format respond to the presence of the organophosphate (OP) pesticides paraoxon and dimethyl-p-nitrophenyl phosphate in solution. These results may lead to novel approaches to detect OP pesticides or other weaponized agents that bind hCE1.
doi:10.1002/btpr.604 pmid:21509954 pmcid:PMC3670151 fatcat:aipx3hpxcnapfdvtbaytsbwmee