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Sodium-induced conformation changes in membrane transport proteins.

B M Charalambous, K P Wheeler

    FEBS Letters
    |September 23, 1985
    PubMed
    Summary

    Sodium ions alter the shape of amino acid transporters in red blood cells. This structural change, triggered by sodium, affects how efficiently cells transport alanine and glycine.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Membrane Transport

    Background:

    • Amino acid transport across cell membranes is crucial for cellular function.
    • Sodium-dependent transport systems play a vital role in nutrient uptake.
    • Understanding the structural dynamics of these transporters is key to elucidating their mechanisms.

    Purpose of the Study:

    • To investigate the role of sodium ions in the conformational changes of amino acid transport proteins.
    • To provide evidence for sodium-induced structural alterations in pigeon erythrocyte and human erythrocyte transporters.

    Main Methods:

    • Enzymatic digestion of pigeon erythrocyte membrane vesicles with trypsin in the presence of KCl versus NaCl.
    • Assessing the impact of digestion on sodium-dependent alanine uptake.
    • Chemical modification of human erythrocytes using N-ethylmaleimide in the presence of KCl versus NaCl.
    • Measuring the effect on sodium-dependent glycine and alanine influx.

    Main Results:

    • Tryptic digestion inactivated sodium-dependent alanine uptake in pigeon erythrocyte vesicles when performed with KCl, but not with NaCl, despite extensive protein degradation in both cases.
    • N-ethylmaleimide inhibited amino acid influx into human erythrocytes more significantly when applied in the presence of KCl compared to NaCl.

    Conclusions:

    • The differential effects of KCl and NaCl during enzymatic and chemical treatments suggest that sodium binding induces conformational changes in amino acid transport proteins.
    • These findings support the hypothesis of sodium-induced conformational transitions in these membrane transporters.

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