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|Title:||Role of Lipopolysaccharide in protecting OmpT from autoproteolysis during in vitro refolding||Authors:||Sinsinbar, Gaurav
Metcalf, Kevin J.
|Keywords:||Science::Biological sciences||Issue Date:||2020||Source:||Sinsinbar, G., Gudlur, S., Metcalf, K. J., Mrksich, M., Nallani, M., & Liedberg, B. (2020). Role of Lipopolysaccharide in protecting OmpT from autoproteolysis during in vitro refolding. Biomolecules, 10(6), 922-. doi:10.3390/BIOM10060922||Project:||MOE2018-T2-1-025
|Journal:||Biomolecules||Abstract:||Outer membrane protease (OmpT) is a 33.5 kDa aspartyl protease that cleaves at dibasic sites and is thought to function as a defense mechanism for E. coli against cationic antimicrobial peptides secreted by the host immune system. Despite carrying three dibasic sites in its own sequence, there is no report of OmpT autoproteolysis in vivo. However, recombinant OmpT expressed in vitro as inclusion bodies has been reported to undergo autoproteolysis during the refolding step, thus resulting in an inactive protease. In this study, we monitor and compare levels of in vitro autoproteolysis of folded and unfolded OmpT and examine the role of lipopolysaccharide (LPS) in autoproteolysis. SDS-PAGE data indicate that it is only the unfolded OmpT that undergoes autoproteolysis while the folded OmpT remains protected and resistant to autoproteolysis. This selective susceptibility to autoproteolysis is intriguing. Previous studies suggest that LPS, a co-factor necessary for OmpT activity, may play a protective role in preventing autoproteolysis. However, data presented here confirm that LPS plays no such protective role in the case of unfolded OmpT. Furthermore, OmpT mutants designed to prevent LPS from binding to its putative LPS-binding motif still exhibited excellent protease activity, suggesting that the putative LPS-binding motif is of less importance for OmpT’s activity than previously proposed.||URI:||https://hdl.handle.net/10356/144253||ISSN:||2218-273X||DOI:||https://doi.org/10.3390/biom10060922||Schools:||School of Materials Science and Engineering||Organisations:||Northwestern University||Rights:||© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).||Fulltext Permission:||open||Fulltext Availability:||With Fulltext|
|Appears in Collections:||MSE Journal Articles|
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|Role of Lipopolysaccharide in Protecting OmpT from autoproteolysis during in vitro refolding.pdf||2.43 MB||Adobe PDF|
|Supplementary_Role of Lipopolysaccharide in Protecting OmpT from Autoproteolysis during In Vitro Refolding.pdf||532.91 kB||Adobe PDF|
Updated on Sep 26, 2023
Updated on Sep 26, 2023
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