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Water binding by glycogen molecules

T Brittain, R Geddes

    Biochimica Et Biophysica Acta
    |October 3, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Low temperature NMR reveals distinct water binding in glycogen. High molecular weight glycogen shows typical binding, while low molecular weight glycogen exhibits anomalous "non-freezing" water characteristics.

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    Area of Science:

    • Biophysics
    • Structural Biology
    • Biochemistry

    Background:

    • Glycogen's interaction with water is crucial for its biological function and structural integrity.
    • Understanding water binding is key to elucidating glycogen's molecular architecture and properties.

    Purpose of the Study:

    • To investigate the characteristics of water bound to glycogen using low-temperature Nuclear Magnetic Resonance (NMR) spectroscopy.
    • To quantify the amount of bound water and determine the associated thermodynamic parameters (energy and entropy).
    • To compare water binding properties between high and low molecular weight glycogen samples.

    Main Methods:

    • Low-temperature Nuclear Magnetic Resonance (NMR) spectroscopy was employed.
    • Analysis of NMR spectra to determine the amount of bound water.

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  • Thermodynamic analysis to evaluate energy and entropy of water binding.

    • Main Results:

    • High molecular weight glycogen (approx. 1-10^9) displayed water binding properties similar to other glycoproteins.
    • Low molecular weight glycogen (approx. 1-10^7) exhibited anomalous binding with significant "non-freezing" water.
    • Quantification of bound water and associated thermodynamic parameters was achieved.

    Conclusions:

    • Glycogen's water binding properties are dependent on its molecular weight.
    • The anomalous binding in low molecular weight glycogen suggests unique structural features or interactions.
    • Findings provide insights into glycogen's molecular architecture and its hydration states.