FIG. 7.

Binding of CRS57 to the complement C6 (solid bars) and C7 (open bars) proteins as determined by an enzyme-linked immunosorbent assay. (A) Binding to the complement proteins in the sera. (B) Binding to the purified C6 and C7 components. CRS1 and CRS57 were recombinant CRS proteins from strains 2031 and BSA5, respectively. The controls included recombinant His-tagged thioredoxin (thio), bovine serum albumin (BSA), and PBS (no coat). The data are averages for triplicate experiments for each protein, and the error bars indicate standard deviations. OD540, optical density at 540 nm.