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Studies on the helical conformational of amylose and possible interconversions

✍ Scribed by P. R. Sundararajan; V. S. R. Rao

Publisher: Wiley (John Wiley & Sons)
Year: 1969
Tongue: English
Weight: 545 KB
Volume: 8
Category: Article
ISSN: 0006-3525
DOI: 10.1002/bip.1969.360080303

No coin nor oath required. For personal study only.

✦ Synopsis

The nonbonded energy (van der Waals) was computed for isolated helical amylose chains as a function of the dihedral angles (+,$), i.e., the relative orientations of the glucose residues in the polysaccharide chain. In conformity with x-ray data, different helical conformations have been proposed for different crystalline modifications of amylose. Right-handed helical conformations were preferred for 71.13, 6].33, and 42.65type helices from minimum energy considerations. The hydrogen bond search reveals the poesibility of formation of strong 0-H. . .0 type hydrogen bonds between contiguous residues in the polymer chain for 61.33 and 71. 13 helices. Smooth transition from a 71.18 to B 6 1 . 3 3 helix is possible with small changes in the values of (4,~) and without the loss of intramolecular hydrogen bonds, whereas all the intramolecular hydrogen bonds will be broken during the conversion from 61.33 to 4 2 . 6 5 helix.

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