Immunodetection of fusion constructs. (A) Western blot analyses of expression of fusion tags in E. coli. Lane 1, Top10; lane 2, Top10/pVPT-CTag; lane 3, Top10/pVPT-Gtf2-CTag; lane 4, Top10/pVPT-NTag-Gtf2. (B) Western blot analyses of expression of fusion tags in S. parasanguinis. Lane 1, wild type; lane 2, gtf2−; lane 3, gtf2−/pVPT-CTag; lane 4, gtf2−/pVPT-Gtf2-CTag; lane 5, gtf2−/pVPT-NTag-Gtf2. Arrows point to the position corresponding to tag or tagged Gtf2 fusion proteins.