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European Biophysics Journal

, Volume 48, Issue 1, pp 25–34 | Cite as

Effect of triphenylphosphonium moiety on spatial structure and biointeractions of stereochemical variants of YRFK motif

  • Ruslan Garifullin
  • Dmitriy S. Blokhin
  • Rezeda A. Akhmadishina
  • Natalia V. Petrova
  • Alexandra M. Kusova
  • Vladimir V. Klochkov
  • Timur I. Abdullin
Original Article
  • 103 Downloads

Abstract

Chemical modification of therapeutic peptides is an important approach to improving their physicochemical and pharmacokinetic properties. The triphenylphosphonium (TPP) cation has proved to be a powerful modifier; however, its effects on peptide structure and activity remain uncharacterized. In this study, cytoprotective tetrapeptides based on the YRFK opioid motif with l- or d-Arg residues were linked to (triphenylphosphonio)carboxylic acids with ethylene and pentylene spacers (TPP-3 and TPP-6 groups, respectively). The three-dimensional structure of the oligopeptides was analyzed by NMR spectroscopy, computational methods and circular dichroism (CD). A more compact and bent structure with segregated aromatic groups was revealed for the d-arginine-containing tetrapeptide and its TPP-6 derivative. The TPP moiety caused structure-organizing effect on the tetrapeptides, resulting in transition from random coil to β-sheet structures, and decreased the peptide backbone flexibility up to ten times. The TPP-3-modified oligopeptide with the lowest RMSD value (ca. 0.05 Å) was characterized by intrapeptide hydrophobic interactions between the TPP and side groups of Tyr and Phe residues accompanied by strong CD induction. The TPP-6-modified oligopeptides showed enhanced ability to form intermolecular associates and disturb liposomal membranes. The relationship between the spatial structure of the oligopeptides and some of their biologically relevant interactions were additionally revealed and are discussed.

Keywords

Cationic–aromatic oligopeptides YRFK motif Triphenylphosphonium derivatives NMR spectroscopy Three-dimensional structure Biointeractions 

Notes

Acknowledgements

This work was performed according to the Russian Government Program of Competitive Growth of the Kazan Federal University. R. G. acknowledges the Russian Foundation for Basic Research (Grant no. 16-33-60146). Dr. T. Mukhametzyanov from Kazan Federal University is acknowledged for his assistance in performing CD measurements. The equipment of Interdisciplinary Centre for Shared Use of Kazan Federal University was used.

Supplementary material

249_2018_1327_MOESM1_ESM.docx (1.2 mb)
Supplementary material 1 (DOCX 1208 kb)

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Copyright information

© European Biophysical Societies' Association 2018

Authors and Affiliations

  • Ruslan Garifullin
    • 1
  • Dmitriy S. Blokhin
    • 1
    • 2
  • Rezeda A. Akhmadishina
    • 1
  • Natalia V. Petrova
    • 1
  • Alexandra M. Kusova
    • 1
    • 3
  • Vladimir V. Klochkov
    • 2
  • Timur I. Abdullin
    • 1
  1. 1.Institute of Fundamental Medicine and BiologyKazan (Volga Region) Federal UniversityKazanRussia
  2. 2.Institute of PhysicsKazan (Volga Region) Federal UniversityKazanRussia
  3. 3.Kazan Institute of Biochemistry and Biophysics FSBIS KSC RASKazanRussia

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