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Related Experiment Videos

Crystallization of macromolecular heparin.

E D Atkins, I A Nieduszynski, A A Horner

    The Biochemical Journal
    |October 1, 1974
    PubMed
    Summary

    Macromolecular heparin from rat skin shows two distinct molecular chain conformations. These conformations change with relative humidity, revealing different crystal structures and helical arrangements.

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    Area of Science:

    • Biochemistry
    • Structural Biology
    • Materials Science

    Background:

    • Heparin is a complex polysaccharide with significant biological roles.
    • Understanding heparin's molecular structure is crucial for its therapeutic applications.
    • Previous studies have investigated heparin structures from different sources.

    Purpose of the Study:

    • To investigate the molecular conformations of macromolecular heparin from rat skin.
    • To determine how relative humidity affects heparin's crystal structure and molecular arrangement.
    • To characterize the helical structures adopted by heparin chains.

    Main Methods:

    • X-ray fibre diffraction was used to analyze oriented films of sodium heparin.
    • Experiments were conducted at varying relative humidity levels (78% and 84%).
    • Diffraction patterns were analyzed to determine layer-line spacings and unit cell parameters.

    Main Results:

    • Two distinct molecular chain conformations were observed, corresponding to different crystal lattices.
    • At 78% relative humidity, a conformation with a 1.73nm layer-line spacing, indicative of a twofold helix, was found.
    • At 84% relative humidity, a second phase with a 1.65nm layer-line repeat and a triclinic unit cell was observed.

    Conclusions:

    • Relative humidity significantly influences the molecular conformation and crystal packing of heparin.
    • Heparin can adopt different helical structures depending on environmental conditions.
    • The findings provide insights into the structural polymorphism of heparin.

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