Title

Conformational Changes of Peptides at Solid/Liquid Interfaces: A Monte Carlo Study

Abstract

Monte Carlo simulations were performed to study the conformational changes of negatively charged model peptides dissolved in water adsorbed onto charged surfaces. 8-, 16-, and 20-residues peptides were used, each of them consisted of repeating diblock units of aspartic acid (ASP, polar amino acid) and isoleucine (ILE, nonpolar amino acid) residues. We found that a water patch was retained at the charged surface, separating the peptide from it. We believed that these water molecules were primarily responsible for giving a particular orientation to the peptide at the surface. Water did play a role to some extent in the structural stability of the 8-residues peptide. However, for higher chain lengths (16-residues and 20-residues), the intrinsic hydrogen-bonding network (or intrinsic structural stability) showed a predominant effect over hydrophobic dehydration for the stability of the peptide at the surface.

Department(s)

Chemical and Biochemical Engineering

Sponsor(s)

National Science Foundation (U.S.)

Keywords and Phrases

Aspartic Acid; Diblock Units; Hydrophobic Dehydration

Library of Congress Subject Headings

Peptides

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2004 American Chemical Society (ACS), All rights reserved.


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