Enhanced cofactor-activity of FH bound to microbial proteins.

<p>Effect of OspE, FhbA, and Tuf (each 50 µg/ml) in elimination of C3b by FH (8–85 µg/ml) and factor I (15 µg/ml). Cleavage of the α′-chain of ¹²⁵I-C3b was measured by evaluating the intensity of the α′-chain in autoradiography (example gel from one out of three experiments shown in panel <b>A</b> with mobility of the C3b fragments and size markers indicated) and intensity in the absence of FH was set as 100% (panel <b>B</b>). As a control, FH was replaced with recombinant FH1-4 fragment (<b>C</b>). Data in panels B and C are from three independent experiments with SDs indicated. * p<0.05, **p<0.01, ***p<0.001.