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Lamellar structure in poly(ala-gly) determined by solid-state NMR and statistical mechanical calculations
Tetsuo Asakura1, Hirohiko Sato, Fumika Moro
1Department of Biotechnology, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan. asakura@cc.tuat.ac.jp
Journal of the American Chemical Society
|April 10, 2007
Summary
Solid-state NMR and statistical mechanics reveal poly(Ala-Gly) peptides adopt a lamellar structure. This structure combines distorted beta-turns and antiparallel beta-sheets, confirmed by various NMR techniques.
Area of Science:
- Biophysics
- Polymer Science
- Spectroscopy
Background:
- Understanding the solid-state structure of polypeptides is crucial for biomaterial design.
- Poly(Ala-Gly) (AG)n is a model peptide with potential applications.
Purpose of the Study:
- To elucidate the lamellar structure of poly(Ala-Gly) in the solid state.
- To investigate the conformational ensemble of (AG)15 using advanced NMR methods.
Main Methods:
- Solid-state 13C NMR spectroscopy, including 2D 13C spin diffusion NMR.
- Rotational Echo Double Resonance (REDOR) and 13C Cross-Polarization Magic Angle Spinning (CP/MAS) NMR.
- Statistical mechanical analysis.
Main Results:
- NMR data indicated a structure comprising distorted beta-turns and antiparallel beta-sheets.
- Spin diffusion NMR revealed structural details consistent with this mixed conformation.
- REDOR measurements provided atomic distances supporting the proposed structural model.
Conclusions:
- Poly(Ala-Gly) (AG)15 exhibits a lamellar structure in the solid state.
- The structure is characterized by a combination of beta-sheets and distorted beta-turns.
- Statistical mechanical analysis strongly supports the observed lamellar structure.
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