Tryptophan end-tagging for promoted lipopolysaccharide interactions and anti-inflammatory effects.Singh, S., Datta, A., Schmidtchen, A., Bhunia, A., Malmsten, M.
(2017) Sci Rep 7: 212-212
- PubMed: 28303012
- DOI: 10.1038/s41598-017-00188-7
- Primary Citation of Related Structures:
- PubMed 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-tagg ...
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.
Department of Pharmacy, Uppsala University, SE-75232, Uppsala, Sweden. firstname.lastname@example.org.,Lee Kong Chian School of Medicine, Nanyang Technological University, 11, Mandalay Road, 308232, Singapore.,Division of Dermatology and Venereology, Department of Clinical Sciences, Lund University, SE-221 84, Lund, Sweden.,Department of Biophysics, Bose Institute, P-1/12 CIT Scheme VII (M), Kolkata, 700054, India.,Department of Pharmacy, Uppsala University, SE-75232, Uppsala, Sweden.