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• W1515492047 abstract "Abstract The N-terminal 29-kDa fragment of fibronectin (Fn29K) contains five type I finger modules. It binds to heparin, fibrin, and bacteria and is involved in fibronectin (Fn) matrix assembly. Binding to Staphylococcus aureus involves a cell wall-associated protein that contains approximately three repeats of a 38-residue D motif (Signas, C., Raucci, G., Jonsson, K., Lindgren, P.-E., Anantharamaiah, G.M., Hook, M., and Lindberg, M. (1989) Proc. Natl. Acad. Sci. U.S.A. 86, 699-703). Synthetic peptides representing D1, D2, and D3, when labeled with fluorescein isothiocyanate (FITC), exhibited increases in fluorescence anisotropy upon addition of Fn29K but not other Fn fragments. The response could be reversed by titration with unlabeled peptides to yield inhibition constants that agreed with the dissociation constants obtained by fitting the initial response. Values of Kd ranged between 2 and 12 microM, with D3 having the highest affinity. Specificity of D3 for Fn29K was further illustrated by the fact that its C-terminal half (D3b, Lys801 to Lys821), when immobilized, selectively adsorbed Fn29K from a thermolysin digest of fibronectin. The binding site in Fn was further localized within Fn29K by analyzing smaller proteolytic or recombinant subfragments. Those containing fingers, F3-5 and F4-5, were purified on D3b-Sepharose and bound FITC-D3b with Kd values of 4-6 microM. Subfragments containing pairs of fingers 1-2, 2-3, or single fingers 1, 4, or 5 were inactive. Whole D1-3, expressed in Escherichia coli and labeled with fluorescein, bound 1.9 mol/mol of Fn29K with Kd = 1.5 nM. F4-5 and F2-3 bound with respective Kd values of 0.35 and 4.4 microM. These and other results indicate that binding of the individual D region peptides is mediated through their C-terminal halves, primarily to fingers 4 and 5 of fibronectin. The possible basis of the much higher affinity of D1-3 is discussed." @default.
• W1515492047 created "2016-06-24" @default.
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• W1515492047 date "1994-06-01" @default.
• W1515492047 modified "2023-10-09" @default.
• W1515492047 title "Interaction of N-terminal fragments of fibronectin with synthetic and recombinant D motifs from its binding protein on Staphylococcus aureus studied using fluorescence anisotropy." @default.
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• W1515492047 doi "https://doi.org/10.1016/s0021-9258(17)40717-4" @default.
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