Aromatic-backbone interactions in model α-helical peptides

Nicholas Y. Palermo, József Csontos, Michael C. Owen, Richard F. Murphy, Sándor Lovas

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The effects on helical stability of weak polar interactions between aromatic side-chains and the peptide backbone were examined. α-Helical model peptides, hexa-Ala, with sequential Tyr replacement, were investigated computationally to obtain the geometries and energetics of the interactions. Geometries were obtained with the B3LYP/6-31G* level of theory. Interaction energies were calculated using BHandHLYP/cc-pVTZ and an improved method to correct for basis set superposition error when fragmentation caused steric clashes. Both i, i + 1 and i, i - 4 interactions were observed when Tyr was in position i = 5. The position of the aromatic residue in the amino acid sequence was crucial in facilitating aromatic-backbone interactions. The distance between the center of the aromatic ring of Tyr and the individual interacting backbone atoms ranged from 3.65 to 5.50 A. The interactions have energies of the same order as hydrogen bonds and, thus, could have a significant impact on the stability of the helix.

Original languageEnglish
Pages (from-to)1208-1214
Number of pages7
JournalJournal of Computational Chemistry
Volume28
Issue number7
DOIs
StatePublished - May 2007

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Backbone
Peptides
Geometry
Interaction
Amino acids
Hydrogen bonds
Amino Acids
Atoms
Model
Hydrogen Bonds
Amino Acid Sequence
Helix
Fragmentation
Energy
Superposition
Replacement
Ring

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Safety, Risk, Reliability and Quality

Cite this

Aromatic-backbone interactions in model α-helical peptides. / Palermo, Nicholas Y.; Csontos, József; Owen, Michael C.; Murphy, Richard F.; Lovas, Sándor.

In: Journal of Computational Chemistry, Vol. 28, No. 7, 05.2007, p. 1208-1214.

Research output: Contribution to journalArticle

Palermo, Nicholas Y. ; Csontos, József ; Owen, Michael C. ; Murphy, Richard F. ; Lovas, Sándor. / Aromatic-backbone interactions in model α-helical peptides. In: Journal of Computational Chemistry. 2007 ; Vol. 28, No. 7. pp. 1208-1214.
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