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. 1977 Jun;59(6):1151–1157. doi: 10.1172/JCI108739

The presence of protein-bound gamma-carboxyglutamic acid in calcium-containing renal calculi.

J B Lian, E L Prien Jr, M J Glimcher, P M Gallop
PMCID: PMC372328  PMID: 864007

Abstract

The amino acid gamma-carboxyglutamic acid (Gla) is found in four blood-clotting proteins, in a bone protein, in kidney protein, and in the protein present in various ectopic calcifications. This paper reports the presence of Gla in the EDTA-soluble, nondialyzable proteins of calcium-containing renal calculi including calcium oxalate, hydroxyapatite, and mixed stores of apatite and struvite (MgNH4PO4). Calculi composed of pure struvite and those composed of only uric acid or cystine do not contain Gla. From calcium oxalate and hydroxyapatite stontes, a protein of about 17,000 daltons was obtained which contained about 40 residues of Gla per 1,000 amino acids. The amino acid composition of this protein had no apparent relationship to the Gla-containing bone protein or to the similarly-sized F1 fragment of prothrombin which contains about 64 residues of Gla per 1,000 amino acid residues. The Gla-rich protein in calcium-containing renal stones thus may be a different Gla-containing protein. These data as well as other studies demonstrating the presence of Gla in pathologically calcified tissues not normally containing Gla suggest that the Gla-containing proteins may be of considerable pathophysiological significance.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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