2NCU

NMR structure of KYE21 in LPS micelles


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

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

  • 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.


    Organizational Affiliation

    Department of Pharmacy, Uppsala University, SE-75232, Uppsala, Sweden. shalini.singh@farmaci.uu.se.,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.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Heparin cofactor 2
A
21Homo sapiensMutation(s): 0 
Gene Names: SERPIND1 (HCF2)
Find proteins for P05546 (Homo sapiens)
Go to Gene View: SERPIND1
Go to UniProtKB:  P05546
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-03-01
    Type: Initial release
  • Version 1.1: 2017-03-29
    Type: Database references
  • Version 1.2: 2017-04-05
    Type: Database references