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Kamran Atabai, Sina Jame, Nabil Azhar, Alex Kuo, Michael Lam, William McKleroy, Greg DeHart, Salman Rahman, Dee Dee Xia, Andrew C. Melton, Paul Wolters, Claire L. Emson, Scott M. Turner, Zena Werb, Dean Sheppard
Published in Volume 119, Issue 12
J Clin Invest. 2009; 119(12):3713–3722 doi:10.1172/JCI40053
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Figure 7
The first discoidin domain of Mfge8 is sufficient for collagen binding and uptake.

(A) Constructs containing full-length (Fl) Mfge8, Mfge8 lacking the terminal discoidin domain (Dd1), or both discoidin domains (Ndd) fused to a huFc domain were immobilized on a Biacore CM5 chip, and binding to increasing doses of collagen was evaluated. P/T represents a domain present in the long isoform of Mfge8 that is rich in proline and threonine. (B) Collagen bound full-length Mfge8 in a dose-dependent fashion with a Kd of 733 nM. (C) Flow plot demonstrating dose-dependent binding of collagen to immobilized full-length construct. Black line, 16 nM; filled squares, 31 nM; open diamonds, 63 nM; filled circles, 125 nM; open triangles, 250 nM; filled diamonds, 500 nM. (D) Flow plot demonstrating dose-dependent binding of collagen to immobilized Dd1 construct. (E) Flow plot demonstrating no binding of collagen to the Ndd construct. (F) The ability of constructs (13 μg/ml) to rescue the defect in alveolar macrophage collagen uptake was evaluated in vitro. Dd1 construct rescued Mfge8–/– alveolar macrophage collagen uptake, while the Ndd construct had no significant effect (*P = 0.01, 1-way ANOVA with Bonferroni t test; n = 3–4). Data are presented as mean ± SEM.