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- W2002136303 abstract "Abstract: β-nerve growth factor (NGF) was modified by biotinylation via carboxyl group substitution (C-bio-NGF) using biotin hydrazide and the coupling reagent 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide, under reaction conditions that yielded an average of 3 biotin additions per NGF subunit. NGF was also biotinylated through amino group substitution, using N-hydroxysuc-cinimidyl biotin, to produce derivatives with ratios of one, two, and four biotin moieties per NGF subunit (N-bio-NGF). The various biotinylated NGF derivatives were compared with native NGF for their capacity to compete with 125I-NGF for binding to NGF receptors on rat pheochromocytoma (PC12) cells at 4°C. On the basis of such radioreceptor assays, C-bio-NGF was as effective as native NGF in binding to NGF receptors. C-bio-NGF was also as effective as native NGF in promoting neunte outgrowth from PC12 cells. In contrast, N-bio-NGF containing one biotin per NGF subunit was only 28% as active in binding as native NGF. Increasing the biotin:NGF ratio to 2 or 4 further decreased receptor binding to 13% and 6%, respectively, as compared to native NGF. Once bound to cells, C-bio-NGF had the capacity to mediate the specific binding of 125I-streptavidin to PC12 cells. This binding of streptavidin was prevented by excess native NGF and by antiserum to NGF, but not by RNase A, insulin, cytochrome c, or nonimmune serum. In addition, a variant PC 12 line lacking functional NGF receptors was not labeled by 125I-streptavidin after prior incubation with C-bio-NGF." @default.
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- W2002136303 date "1986-02-01" @default.
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- W2002136303 title "Receptor Binding Activities of Biotinylated Derivatives of ?-Nerve Growth Factor" @default.
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- W2002136303 doi "https://doi.org/10.1111/j.1471-4159.1986.tb13015.x" @default.
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