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Zinc binding by glycosaminoglycans.

C S Sato, F Gyorkey

    Journal of Biochemistry
    |October 1, 1976
    PubMed
    Summary

    Glycosaminoglycans (GAGs) exhibit varying zinc (65Zn) binding affinities influenced by pH. Differences in binding ratios were observed across GAG types, with some showing higher affinity at pH 4.0 and others at pH 7.0.

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    Area of Science:

    • Biochemistry
    • Biomaterials Science
    • Analytical Chemistry

    Background:

    • Glycosaminoglycans (GAGs) are vital components of the extracellular matrix with diverse biological roles.
    • Understanding GAG-metal ion interactions is crucial for applications in biomaterials and therapeutics.
    • Zinc is an essential trace element involved in numerous physiological processes.

    Purpose of the Study:

    • To investigate the zinc-binding capacities of seven standard GAGs.
    • To determine the influence of pH (4.0 and 7.0) on GAG-zinc interactions.
    • To compare the zinc-binding affinities across different GAG structures.

    Main Methods:

    • Gel filtration chromatography using Sephadex G-25 was employed.
    • Radioisotope 65Zn was used to quantify bound zinc.
    • Molar zinc-binding ratios were calculated based on hexuronic acid and sulfate content.

    Main Results:

    • Significant differences in molar zinc-binding ratios were observed for chondroitin-4-sulfate (C4S), chondroitin-6-sulfate (C6S), dermatan sulfate (DS), hyaluronic acid (HA), and heparin sulfate (HS) at pH 4.0 versus pH 7.0.
    • Heparan sulfate (HP) and keratan sulfate (KS) showed no significant pH-dependent differences in zinc binding.
    • C4S, C6S, and DS exhibited higher binding ratios at pH 4.0, while HA and HS showed lower binding ratios at pH 4.0 compared to pH 7.0.

    Conclusions:

    • GAGs display differential zinc-binding affinities that are sensitive to pH.
    • The structural characteristics of GAGs, particularly sulfation patterns, influence their interaction with zinc ions.
    • These findings provide insights into the behavior of GAGs in zinc-containing biological and material environments.

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