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- W1538172021 abstract "Binding sites having the characteristics of receptors for activated alpha 2-macroglobulin (alpha 2M) have been solubilized with octyl-beta-D-glucoside from fibroblast membranes. When the detergent was removed by dialysis, the resulting insoluble extract was shown to bind 125I-alpha 2M specifically. Analysis of the binding data using a nonlinear curve-fitting program suggests that the solubilized preparation contains two classes of binding sites (KD = 0.34 nM and KD = 104 nM). Membranes or solubilized extracts from KB cells which lack alpha 2M binding sites did not specifically bind 125I-alpha 2M. The solubilized binding sites from fibroblasts were inactivated by boiling and trypsin treatment, and required Ca+2 for maximal binding. In addition, the high affinity binding of 125I-alpha 2M to the solubilized receptor was inhibited by bacitracin and by alpha-bromo-5-iodo-4-hydroxy-3-nitroacetophenone, two agents which interfere with the uptake of alpha 2M in cultured fibroblasts. Using a combination of ion exchange and gel permeation chromatography, we have purified the high affinity alpha 2M binding site approximately 100-fold from membrane derived from NIH-3T3 (spontaneously transformed) fibroblasts grown as tumors in mice. The receptor is apparently an acidic protein and the receptor octyl-beta-D-glucoside complex has a Stokes radius of 45-50 A as measured by gel filtration." @default.
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- W1538172021 date "1983-01-01" @default.
- W1538172021 modified "2023-09-30" @default.
- W1538172021 title "alpha 2-Macroglobulin binding to cultured fibroblasts. Solubilization and partial purification of binding sites." @default.
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- W1538172021 doi "https://doi.org/10.1016/s0021-9258(18)33267-8" @default.
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