Revisit of alpha-chitin crystal structure using high resolution X-ray diffraction data

  • Sikorski P
  • Hori R
  • Wada M
  • 2

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Abstract

High resolution synchrotron X-ray fiber diffraction data recorded from crab tendon chitin have been used to describe the crystal structure of alpha-chitin. Crystal structures at 100 and 300 K have been solved using restrained crystallographic refinement against diffraction intensities measured from the fiber diffraction patterns. The unit cell contains two polymer chains in a 2(1) helix conformation and in the antiparallel orientation. The best agreement between predicated and observed X-ray diffraction intensities is obtained for a model that includes two distinctive conformations of C6-O6 hydroxymethl group. Those conformations are different from what is proposed in the generally accepted alpha-chitin crystal structure (J. Mol. Biol. 1978, 120, 167-181). Based on refined positions of the O6 atoms, a network of hydrogen bonds involving O6 is proposed. This network of hydrogen bonds can explain the main features of the polarized FTIR spectra of alpha-chitin and sheds some light on the origin of splitting of the amide I band observed on alpha-chitin IR spectra

Author-supplied keywords

  • Chitin
  • Crystallography,X-Ray
  • Hydrogen Bonding
  • Light
  • Models,Molecular
  • Molecular Conformation
  • Spectroscopy,Fourier Transform Infrared
  • X-Ray Diffraction
  • chemistry

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Authors

  • P Sikorski

  • R Hori

  • M Wada

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