Phosphopeptides and gamma-carboxyglutamic acid-containing peptides in calcified turkey tendon: their absence in uncalcified tendon.
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.
D015055:1-Carboxyglutamic Acid / Q000032:analysis*; D000375:Aging; D000818:Animals; D005260:Female; D005971:Glutamates / Q000032:analysis*; D009943:Organophosphorus Compounds / Q000032:analysis; D010455:Peptides / Q000032:analysis; D010748:Phosphopeptides / Q000032:analysis*; D012694:Serine / Q000032:analysis; D013710:Tendons / Q000254:growth & development*; D013912:Threonine / Q000032:analysis; D014422:Turkeys
D005971:Glutamates; D009943:Organophosphorus Compounds; D010455:Peptides; D010748:Phosphopeptides; D013912:Threonine; D012694:Serine; D015055:1-Carboxyglutamic Acid