Figure 2.

Cell-surface labeling with biotin. The surface proteins of P. gingivalis and T. forsythia were labeled with Sulfo-NHS-LC-Biotin and mixed with T. forsythia and P. gingivalis cells, respectively. Subsequently, the mixtures were subjected to SDS-PAGE, and then transferred onto nitrocellulose membranes. Biotinylated P. gingivalis and T. forsythia surface proteins were detected with streptavidin–HRP and 4-CN. Lanes: MW, molecular weight marker; Tf, biotinylated T. forsythia surface proteins bound to P. gingivalis; Pg, biotinylated P. gingivalis surface proteins bound to T. forsythia