Impact of a micellar environment on the conformations of two cyclic pentapeptides

M. D. Bruch, Jose Rizo-Rey, L. M. Gierasch

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

In an effort to explore the influence of interfacial environments on reverse turns, we have performed a detailed analysis by nmr of the solution conformations of two cyclic pentapeptides in sodium dodecyl sulfate (SDS) micelles. The first peptide, cyclo(D-Phe1-Pro2-Gly3-D-Ala4-Pro5), adopts a single rigid conformation in solution (either chloroform or dimethylsulfoxide) and in crystals, whereas the second, cyclo(Gly1-Pro2-D- Phe3-Gly4-Val5), is much more flexible and adopts different conformations in the crystal and in solution. Both of these peptides are solubilized by SDS micelles, and nmr relaxation rates indicate that they are both partially immobilized by interaction with the micelles. Furthermore, some amide protons in both peptides participate in hydrogen bonds with water. In the presence of micelles, the former peptide retains a conformation essentially the same as that found in crystals and in solution, which consists of a β turn and an inverse γ turn. However, the micellar environment has a significant effect on the latter peptide. In particular, the population of a conformer containing a cis Gly-Pro peptide bond is increased significantly. The most likely conformation of the cis isomer, determined by a combination of nmr and restrained molecular dynamics, contains a Gly1-Pro2 δ turn and a γ turn about D-Phe3. The nmr data on the trans isomer indicate that this isomer is averaging between two conformations that differ mainly in the orientation of the D-Phe3-Gly4 peptide bond.

Original languageEnglish (US)
Pages (from-to)1741-1754
Number of pages14
JournalBiopolymers
Volume32
Issue number12
DOIs
StatePublished - Dec 1992

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Peptides
Conformations
Micelles
Isomers
Sodium dodecyl sulfate
Sodium Dodecyl Sulfate
Crystals
glycylproline
Molecular Dynamics Simulation
Chloroform
Chlorine compounds
Dimethyl Sulfoxide
Amides
Crystal orientation
Molecular dynamics
Protons
Hydrogen
Hydrogen bonds
Water
Population

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry
  • Biophysics

Cite this

Impact of a micellar environment on the conformations of two cyclic pentapeptides. / Bruch, M. D.; Rizo-Rey, Jose; Gierasch, L. M.

In: Biopolymers, Vol. 32, No. 12, 12.1992, p. 1741-1754.

Research output: Contribution to journalArticle

Bruch, M. D. ; Rizo-Rey, Jose ; Gierasch, L. M. / Impact of a micellar environment on the conformations of two cyclic pentapeptides. In: Biopolymers. 1992 ; Vol. 32, No. 12. pp. 1741-1754.
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