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. 1979 Jul 3;27(3):281-4.
doi: 10.1007/BF02441198.

Phosphopeptides and gamma-carboxyglutamic acid-containing peptides in calcified turkey tendon: their absence in uncalcified tendon

M J Glimcher, D Brickley-Parsons, D Kossiva

Phosphopeptides and gamma-carboxyglutamic acid-containing peptides in calcified turkey tendon: their absence in uncalcified tendon

M J Glimcher et al. Calcif Tissue Int. .

Abstract

Uncalcified samples of turkey tendon obtained prior to calcification, and other samples from areas of tendon that never calcify, contain little or no O-phosphoserine [Ser(P)], O-phosphothreonine [Thr(P)] and gamma-carboxyglutamic acid (Gla). Significant amounts of all three of these Ca2+-binding amino acids, which are found in EDTA-extractable, non-collagenous proteins, are detected coincident with the onset of mineralization of a tendon and increase in concentration as mineralization proceeds.

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