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Phosphate-binding proteolipid from brush border

R J Kessler, D A Vaughn, D D Fanestil

    The Journal of Biological Chemistry
    |December 10, 1982
    PubMed
    Summary
    This summary is machine-generated.

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    Publish and perish?

    Journal of the American Society of Nephrology : JASN·1999

    Researchers identified a kidney proteolipid that binds and transports inorganic phosphate. This molecule is a strong candidate for the renal tubule

    Area of Science:

    • Biochemistry
    • Renal Physiology

    Background:

    • Inorganic phosphate (Pi) transport is crucial for renal function.
    • The molecular mechanisms of renal Pi reabsorption are not fully elucidated.

    Purpose of the Study:

    • To isolate and characterize a proteolipid involved in phosphate binding and transport from rabbit kidney brush-border membranes.
    • To investigate the role of this proteolipid in renal phosphate uptake.

    Main Methods:

    • Extraction and partial purification of proteolipid using LH-20 chromatography.
    • Determination of molecular weight via SDS-PAGE.
    • Assay of phosphate binding affinity (K0.5) and inhibition kinetics.
    • Analysis of Na+-driven Pi uptake in renal brush-border membrane vesicles.

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    Main Results:

    • A high-affinity, specific inorganic phosphate-binding proteolipid (MW ~3000 Da) was isolated.
    • The proteolipid demonstrated phosphate binding (K0.5 = 8 µM) and transport into an organic phase.
    • Phosphate binding was competitively inhibited by arsenate and by 2,4-dinitrofluorobenzene, which also inhibited Na+-driven Pi uptake.
    • Unlike mitochondrial phosphate binders, this proteolipid was not inhibited by sulfhydryl reagents.

    Conclusions:

    • The characterized proteolipid is a strong candidate for mediating phosphate uptake in the renal tubule.
    • Its distinct inhibition profile differentiates it from other known phosphate-binding proteins.