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  • Wiley-Blackwell  (2)
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  • Wiley-Blackwell  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    The V amylose-H2O system: Structural changes resulting from hydration (1974)
    New York : Wiley-Blackwell
    Biopolymers 13 (1974), S. 779-790 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: X-ray diffraction and stereochemical analyses were used to study the hydrated structure of the helical amylose polymorph having a fiber repeat spacing of 8 Å. Intensity calculations using computer models confirmed six as the number of residues per turn and supported the space group P212121. Both diffraction intensity and stereochemical methods indicate the suitability of residue G3 from the potassium acetate complex of cyclohexaamylose as opposed to residues with longer O(4)-O(1) vectors. Comparison of the present results with those obtained for V amylose dehydrate indicated no major conformational differences between the two helix skeletons. A net helical rotation of approximately 30° accompanied the hydrate-dehydrate transition and the rotational position in the hydrate allowed packing that was less close. Hydration water molecules were not located; noncarbohydrate peaks on the electron density maps were primarily due to Fourier series termination errors.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1974.360130413
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  • 2
    Electronic Resource
    Electronic Resource
    The structure of V amylose dehydrate: A combined X-ray and stereochemical approach (1975)
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 1487-1501 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Visually integrated, flat-plate film data were collected from oriented filaments of V amylose dehydrated made from dimethyl sulfoxide-amylose; and X-ray diffraction and stereochemical methods were used to search a multidimensional parameter space for the most satisfactory description of the crystal and molecular structure. Results indicate that the helical chains are left-handed and that they pack into the unit cell in an antiparallel arrangement conforming to space group P212121. Packing is very compact with several O …. O contacts in the range 2.70-2.85 Å between both parallel and antiparallel pairs of chains. Other characteristics of the final model are residue geometry similarity to residue 3 from potassium acetate-cyclohexamylose, O(2)i-O(3)i+1 distance of 2.75 Å, O(6) gg, and O(6)i-O(2)i-6 distance of 2.84 Å. Proton magnetic resonance studies of dried, crystalline V amylose dehydrate powder showed only 0.15 water per glucose residue.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1975.360140714
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    Paper (German National Licenses)
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