FIG. 8.

Binding of soluble host proteins to T. denticola cells and proteins. (A) ELISA format. FN, plasminogen (Pgn), or BSA in PBS were added to wells containing immobilized T. denticola ATCC 35405 cells (T.d.), native OppA (OppA), recombinant LacZ-OppA fusion protein (rOppA40), recombinant Msp (rMsp), or BSA. Bound FN and plasminogen were detected with anti-FN (shaded bars) and anti-plasminogen (hatched bars) antibodies, respectively. The y axis shows absorbance at 405 nm. Data shown represent the means ± standard deviations of at least two experiments using triplicate samples. (B) Ligand blot format. Duplicate samples of protein (1 μg) or cells (0.1 ml, OD₆₀₀ = 0.2) applied to nitrocellulose membranes were probed with plasminogen (samples 2 to 4) or plasminogen plus EACA (sample 5). Bound plasminogen was detected with anti-plasminogen immunoglobulin G. Lanes: 1, Plasminogen; 2, 5, and 6, T. denticola ATCC 35405; 3, T. denticola OHE; 4, T. denticola MHE.