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pH-dependent changes of 2,3-bisphosphoglycerate.

I Rapoport, H Berger, R Elsner

    Acta Biologica Et Medica Germanica
    |January 1, 1977
    PubMed
    Summary
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    This study investigated pH effects on 2,3 bisphosphoglycerate (2,3-DPG) levels. 2,3-DPGase activity is pH-independent, while 2,3-DPG mutase is inhibited below pH 6.9.

    Area of Science:

    • Biochemistry
    • Cellular Metabolism

    Background:

    • 2,3 bisphosphoglycerate (2,3-DPG) is a key regulator of hemoglobin-oxygen affinity.
    • Understanding its metabolic regulation, particularly pH-dependent changes, is crucial for cellular function.

    Purpose of the Study:

    • To systematically investigate the pH-dependent changes in 2,3-DPG levels.
    • To characterize the activity of 2,3-DPGase and 2,3-DPG mutase across a physiological pH range (6.6-7.4).
    • To determine the influence of glucose on 2,3-DPG steady-state levels and bypass activity.

    Main Methods:

    • Systematic study of 2,3-DPG changes in red blood cells.
    • Measurements performed in the presence and absence of glucose.
    • Analysis during transitional and steady states across varying pH levels.

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    Main Results:

    • 2,3-DPGase activity is largely pH-independent, with a breakdown rate of 480 μmoles 2,3-DPG/1 cells/h.
    • 2,3-DPG mutase activity is significantly inhibited below pH 6.9.
    • In the presence of glucose, 2,3-DPG levels reach a pH-dependent steady state after approximately 18 hours.
    • The contribution of the 2,3-DPG bypass to the steady state decreases from 24% at pH 7.4 to 12% at pH 7.0.
    • Pyruvate formation correlates with 2,3-DPG breakdown.

    Conclusions:

    • The study elucidates the distinct pH dependencies of key enzymes in the 2,3-DPG metabolic pathway.
    • Glucose influences the steady-state levels and metabolic routing of 2,3-DPG in a pH-dependent manner.
    • These findings provide insights into the regulation of oxygen transport under varying physiological conditions.