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Where does phosphoglycolate come from in red cells?

S Fujii, E Beutler

    Acta Haematologica
    |January 1, 1985
    PubMed
    Summary
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    Human red blood cells lack ribulose-1,5-diphosphate (Ru-1,5-P2) oxygenase activity, an enzyme crucial for phosphoglycolate synthesis. This finding questions the presence and origin of phosphoglycolate in red cells.

    Area of Science:

    • Biochemistry
    • Human Physiology

    Background:

    • Human red blood cells (RBCs) are central to oxygen transport.
    • The enzyme ribulose-1,5-diphosphate (Ru-1,5-P2) oxygenase catalyzes phosphoglycolate synthesis, a key step in photorespiration.

    Purpose of the Study:

    • To investigate the presence of Ru-1,5-P2 oxygenase activity in human red blood cells.
    • To determine if human RBCs synthesize phosphoglycolate via this oxygenase pathway.

    Main Methods:

    • Partial purification of putative Ru-1,5-P2 oxygenase from human RBCs using DE-52 chromatography and ammonium sulfate fractionation.
    • Assay for Ru-1,5-P2-dependent 3-phosphoglycerate formation.
    • Attempted synthesis of radioactive phosphoglycolate from radioactive Ru-1,5-P2 in the presence of the partially purified enzyme preparation under 100% oxygen.

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    Main Results:

    • No formation of radioactive phosphoglycolate was detected, even under high oxygen conditions.
    • The partially purified preparation did not exhibit Ru-1,5-P2 oxygenase activity.

    Conclusions:

    • Human red blood cells do not possess ribulose-1,5-diphosphate oxygenase activity.
    • The absence of this enzyme challenges the established pathway for phosphoglycolate synthesis in RBCs.
    • Further research is needed to ascertain the presence of phosphoglycolate and explore alternative synthesis pathways in human red cells.