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  • Title: Elucidation of multiple forms of nephrocalcin by 31P-NMR spectrometer.
    Author: Nakagawa Y, Otsuki T, Coe FL.
    Journal: FEBS Lett; 1989 Jul 03; 250(2):187-90. PubMed ID: 2753126.
    Abstract:
    Four forms of nephrocalcin have been routinely isolated from mammalian kidney tissues and urine using DEAE-cellulose column chromatography with a linear NaCl gradient. We have demonstrated that these four forms of nephrocalcin, isolated from bovine kidneys, contain different amounts of phosphate residues, and that alkaline phosphatase digestion converts these to only one form of nephrocalcin. The changes in the nephrocalcin before and after removal of phosphate residues were measured by 31P-NMR spectrometer. Loss of phosphate residues decreased the dissociation constant of nephrocalcin 10-fold toward calcium oxalate monohydrate crystals, suggesting the phosphate residues appear to be important in the inhibitory effects of calcium oxalate monohydrate crystal growth.
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