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Biophysical Journal 71: 3022-3029 (1996)
© 1996 the Biophysical Society

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Salt effects on peptide conformers: a dielectric study of tuftsin.

L Yang, C V Valdeavella, H D Blatt and B M Pettitt

Department of Chemistry, University of Houston, Texas 77204-5641, USA.

ABSTRACT

Four 1-ns molecular dynamics computer simulations of tuftsin, Thr-Lys-Pro-Arg, are analyzed: (1) cis tuftsin in water, (2) trans tuftsin 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.






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Copyright © 1996 by the Biophysical Society.