Salt effects on peptide conformers: A dielectric study of tuftsin

Liqui Yang, Claudia V. Valdeavella, Herb D. Blatt, B. Montgomery Pettitt

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Four 1-ns molecular dynamics computer simulations of tuftsin, Thr-Lys- Pro-Arg, are analyzed: (1) cis tuftsin in water, (2) trans tuffsin in water, (3) cis tuftsin in 1 M NaCl, and (4) trans tuftsin in 1 M NaCl. Independently of the salt concentration, the trans conformer has a higher dielectric constant than the cis conformer because the former exhibits a more widely distributed charge distribution in space. Independently of the peptide conformation, the presence of salt reduces the dielectric constants of both the peptide and the solvating water molecules because ions, on binding, restrict the motion of other atoms. In contrast to the dielectric constants, neither the peptide conformation nor the salt concentration shows a significant influence on the dielectric relaxation time of water molecules.

Original languageEnglish (US)
Pages (from-to)3022-3029
Number of pages8
JournalBiophysical journal
Issue number6
StatePublished - Dec 1996
Externally publishedYes

ASJC Scopus subject areas

  • Biophysics


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