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Title: Tryptophan end-tagging for promoted lipopolysaccharide interactions and anti-inflammatory effects
Authors: Singh, Shalini
Datta, Aritreyee
Schmidtchen, Artur
Bhunia, Anirban
Malmsten, Martin
Keywords: Anti-inflammatory effects
Tryptophan end-tagging
Issue Date: 2017
Source: Singh, S., Datta, A., Schmidtchen, A., Bhunia, A., & Malmsten, M. (2017). Tryptophan end-tagging for promoted lipopolysaccharide interactions and anti-inflammatory effects. Scientific Reports, 7, 212-.
Series/Report no.: Scientific Reports
Abstract: The objective of the present study is the investigation of possibilities for boosting peptide anti-inflammatory effects by tryptophan end-tagging, including identification of underlying mechanisms for this. In doing so, effects of tryptophan end-tagging of KYE21 (KYEITTIHNLFRKLTHRLFRR), a peptide derived from heparin co-factor II, on membrane and lipopolysaccharide (LPS) interactions were investigated by ellipsometry, NMR, fluorescence spectroscopy, and circular dichroism measurements. Through its N-terminal W stretch, WWWKYE21 displays higher membrane binding, liposome rupture, and bacterial killing than unmodified KYE21. Analogously, W-tagging promotes binding to E. coli LPS and to its endotoxic lipid A moiety. Furthermore, WWWKYE21 causes more stable peptide/LPS complexes than KYE21, as evidenced by detailed NMR studies, adopting a pronounced helical conformation, with a large hydrophobic surface at the N-terminus due to the presence of W-residues, and a flexible C-terminus due to presence of several positively charged arginine residues. Mirroring its increased affinity for LPS and lipid A, WWWKYE21 displays strongly increased anti-inflammatory effect due to a combination of direct lipid A binding, peptide-induced charge reversal of cell membranes for LPS scavenging, and peptide-induced fragmentation of LPS aggregates for improved phagocytosis. Importantly, potent anti-inflammatory effects were observed at low cell toxicity, demonstrated for both monocytes and erythrocytes.
ISSN: 2045-2322
DOI: 10.1038/s41598-017-00188-7
Schools: Lee Kong Chian School of Medicine (LKCMedicine) 
Rights: © 2017 The Author(s). This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:LKCMedicine Journal Articles

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