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• W2029561283 abstract "Monoclonal antibody HTP IV-#1 specifically recognizes a complexation-dependent neoepitope on bone acidic glycoprotein-75 (BAG-75) and a Mr = 50 kDa fragment. Complexes of BAG-75 exist in situ, as shown by immunofluorescent staining of the primary spongiosa of rat tibial metaphysis and osteosarcoma cell micromass cultures with monoclonal antibody HTP IV-#1. Incorporation of BAG-75 into complexes by newborn growth plate and calvarial tissues was confirmed with a second, anti-BAG-75 peptide antibody (#503). Newly synthesized BAG-75 immunoprecipitated from mineralizing explant cultures of bone was present entirely in large macromolecular complexes, while immunoprecipitates from monolayer cultures of osteoblastic cells were previously shown to contain only monomeric Mr = 75 kDa BAG-75 and a 50 kDa fragment. Purified BAG-75 self-associated in vitro to form large spherical aggregate structures composed of a meshwork of 10 nm diameter fibrils. These structures have the capacity to sequester large amounts of phosphate ions as evidenced by X-ray microanalysis and by the fact that purified BAG-75 preparations, even after extensive dialysis against water, retained phosphate ions in concentrations more than 1,000-fold higher than can be accounted for by exchange calculations or by electrostatic binding. The ultrastructural distribution of immunogold-labeled BAG-75 in the primary spongiosa underlying the rat growth plate is distinct from that for other acidic phosphoproteins, osteopontin and bone sialoprotein. We conclude that BAG-75 self-associates in vitro and in vivo into microfibrillar complexes which are specifically recognized by monoclonal antibody HTP IV-#1. This propensity to self-associate into macromolecular complexes is not shared with acidic phosphoproteins osteopontin and bone sialoprotein. We hypothesize that an extracellular electronegative network of macromolecular BAG-75 complexes could serve an organizational role in forming bone or as a barrier restricting local diffusion of phosphate ions." @default.
• W2029561283 created "2016-06-24" @default.
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• W2029561283 date "1997-03-15" @default.
• W2029561283 modified "2023-10-10" @default.
• W2029561283 title "Bone acidic glycoprotein-75 self-associates to form macromolecular complexes in vitro and in vivo with the potential to sequester phosphate ions" @default.
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• W2029561283 doi "https://doi.org/10.1002/(sici)1097-4644(19970315)64:4<547::aid-jcb3>3.0.co;2-r" @default.
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