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• W1586555770 abstract "Demineralizing extracts of porcine bone contain two large 66-80-kDa sialoproteins and smaller 20- and 23-kDa glycoproteins with similar chemical properties. Each protein was characterized following extraction from fetal calvariae and purification under dissociative conditions using Sepharose CL-6B, followed by fast protein liquid chromatography fractionation on hydroxyapatite and Mono Q resins. Unlike the large sialoproteins, the 20- and 23-kDa glycoproteins did not contain sialic acid. Nevertheless, affinity-purified antibodies raised against the 23-kDa protein recognized both the 20-kDa protein and a 67-kDa sialoprotein on immunoblots. These antibodies also immunoprecipitated a 60-kDa [35S]methionine-labeled protein produced by cell-free synthesis of calvarial bone mRNA, indicating that the smaller proteins were derived from the 67-kDa protein. The two sialoproteins were shown by primary sequence analysis to be secreted phosphoprotein I (SPPI, osteopontin, bone sialoprotein I) and bone sialoprotein (BSP, bone sialoprotein II). The SPPI was also characterized by its susceptibility to thrombin which produced a 23-kDa fragment, similar to the glycoprotein isolated, and a 30-kDa fragment. Amino-terminal sequence analysis of the 23- and 20-kDa proteins revealed that these proteins were derived from the carboxyl-terminal half of the SPPI molecule, the proteins showing 58% identity with human and rat, and 50% identity with mouse, SPPI sequences. Both the 23- and 20-kDa proteins appeared to be generated by the activity of an endogenous trypsin-like protease that cleaves at Arg-Ser (residues 155-156) and Lys-Ala (residues 182-183) bonds. Radiolabeling studies performed in vitro showed that the 23-kDa fragment was detectable in mineralized tissue within 4 h. The fragment was phosphorylated but, unlike SPPI, was not sulfated. The rapid generation of the 23-kDa glycoprotein and its presence in different bone tissues at different developmental stages indicate that the fragmentation of SPPI is important in bone formation and remodeling." @default.
• W1586555770 created "2016-06-24" @default.
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• W1586555770 date "1990-05-01" @default.
• W1586555770 modified "2023-09-27" @default.
• W1586555770 title "Characterization of fetal porcine bone sialoproteins, secreted phosphoprotein I (SPPI, osteopontin), bone sialoprotein, and a 23-kDa glycoprotein. Demonstration that the 23-kDa glycoprotein is derived from the carboxyl terminus of SPPI." @default.
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• W1586555770 doi "https://doi.org/10.1016/s0021-9258(19)39154-9" @default.
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