Circular dichroism and stoicheiometric evidence is presented, which indicates that the calcium-mediated association of pectate chains under hydrated conditions occurs by a pairwise mechanism in which the chains adopt two fold symmetry; this contrasts with the known three-fold conformation into which the chains convert in the solid state, and represents an unusual example of an ordered polysaccharide tertiary structure which is stabilised by high levels of hydration.
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Gidley et al. (1979) studied this question.