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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Breen, Nicholas F. Li, Kun Drobny, Gary P. Olsen, Gregory L. |
| Description | Author Affiliation: Breen NF ( Department of Chemistry, University of Washington, Seattle, Washington 98195, United States.) |
| Abstract | LK 14 is a 14 amino acid peptide with a periodic sequence of leucine and lysine residues consistent with an amphipathic -helix. This 'hydrophobic periodicity' has been found to result in an -helical secondary structure at air-water interfaces and on both polar and nonpolar solid polymer surfaces. In this paper, the dynamics of LK 14 peptides, selectively deuterated at a single leucine and adsorbed onto polystyrene and carboxylated polystyrene beads, are studied using (2)H magic angle spinning (MAS) solid state NMR over a 100 °C temperature range. We first demonstrate the sensitivity enhancement possible with (2)H MAS techniques, which in turn enables us to obtain high-quality (2)H NMR spectra for selectively deuterated peptides adsorbed onto solid polymer surfaces. The extensive literature shows that the dynamics of leucine side chains are sensitive to the local structural environment of the protein. Therefore, the degree to which the dynamics of leucine side chains and the backbone of the peptide LK 14 are influenced by surface proximity and surface chemistry is studied as a function of temperature with (2)H MAS NMR. It is found that the dynamics of the leucine side chains in LK 14 depend strongly upon the orientation of the polymer on the surface, which in turn depends on whether the LK 14 peptide adsorbs onto a polar or nonpolar surface. (2)H MAS line shapes therefore permit probes of surface orientation over a wide temperature range. |
| ISSN | 15206106 |
| e-ISSN | 15205207 |
| Journal | The Journal of Physical Chemistry B |
| Issue Number | 30 |
| Volume Number | 115 |
| Language | English |
| Publisher | American Chemical Society (United States) |
| Publisher Date | 2011-08-04 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Chemistry, Organic Nuclear Magnetic Resonance, Biomolecular Peptides Chemistry Polystyrenes Adsorption Deuterium Protein Structure, Secondary Surface Properties Temperature Research Support, N.I.H., Extramural Physical chemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Surfaces, Coatings and Films Materials Chemistry Medicine Physical and Theoretical Chemistry |
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