Abstract
Frei and Preston1 have described the discovery of a two-strand helical model for a β-1,3-linked xylan polymer which is the structural polysaccharide in some siphoneous green algae. We have recently proposed a new structure for this material2 in which six β-1,3-linked xylose residues form a helix of pitch 18.36 Å, three such helical chains intertwining with line symmetry sr3. The compound helices are regularly positioned in a hexagonal lattice. Preliminary results show that the diffraction intensities observed on the rather good X-ray fibre diagram agree well with the computed values for our model (to be described elsewhere).
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References
Frei, Eva, and Preston, R. D., Proc. Roy. Soc., B, 160, 293 (1964).
Atkins, E. D. T., Parker, K. D., and Preston, R. D., Proc. Roy. Soc., B (in the press).
Klug, A., Crick, F. H. C., and Wyckoff, H. W., Acta Cryst., 11, 199 (1958).
Nakamoto, K., Margoshes, M., and Rundle, R. E., J. Amer. Chem. Soc., 77, 6480 (1955).
Brown, G. M., and Levy, H. A., Science, 141, 921 (1963).
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ATKINS, E., PARKER, K. Cyclic Triad of Hydrogen Bonds in a Helical Polymer. Nature 220, 784–785 (1968). https://doi.org/10.1038/220784a0
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DOI: https://doi.org/10.1038/220784a0
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