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Solid-state 13C NMR and X-ray diffraction of dermatan sulfate
Biochemical and Biophysical Research Communications
|May 29, 1986
Summary
Solid-state studies of dermatan sulfate using NMR and X-ray diffraction suggest a predominant 1C4 ring conformation for the L-iduronate moiety. This finding reconciles differing interpretations from NMR and X-ray data.
Area of Science:
- Biochemistry
- Carbohydrate Chemistry
- Solid-State Chemistry
Background:
- Dermatan sulfate is a glycosaminoglycan with important biological functions.
- Understanding its solid-state structure is crucial for elucidating its properties.
- The L-iduronate moiety's ring conformation has been a subject of investigation.
Purpose of the Study:
- To determine the ring conformation of the L-iduronate moiety in solid-state dermatan sulfate.
- To reconcile structural data obtained from different spectroscopic and diffraction techniques.
Main Methods:
- 13C Cross-Polarization Magic Angle Spinning Nuclear Magnetic Resonance (CP/MAS NMR) spectroscopy.
- X-ray powder diffraction analysis.
Main Results:
- Solid-state 13C CP/MAS NMR spectra closely resemble solution spectra, indicating a predominant 1C4 ring conformation for L-iduronate.
- X-ray powder diffraction data suggest an 8-fold helix form, previously interpreted as a 4C1 ring conformation.
- A distorted 1C4 conformation offers a unified explanation for both NMR and X-ray diffraction findings.
Conclusions:
- The L-iduronate moiety in solid-state dermatan sulfate likely adopts a distorted 1C4 ring conformation.
- This conformation provides a consistent interpretation of NMR and X-ray diffraction data.
- Further refinement of structural models is warranted.