Journal: Infection and Immunity
Article Title: Molecular Analysis of Group B Protective Surface Protein, a New Cell Surface Protective Antigen of Group B Streptococci
Figure Lengend Snippet: (A) Recombinant expression of GST-tagged BPS in E. coli XL 1-Blue MRF" and purification by glutathione-agarose affinity chromatography. The Coomassie-stained gel shows E. coli whole-cell extracts prior to induction (lane 1) and after induction (lane 2) and purified recombinant BPS fusion protein (lane 3). (B) Western blot analysis of whole-cell lysates of GBS strain Compton R (lane 1), E. coli XL 1-Blue MRF" harboring plasmid pGEX2T (lane 2), and E. coli XL 1-Blue MRF" harboring plasmid pSE4 (lane 3) using a polyclonal antiserum raised against purified recombinant GST-BPS fusion protein. (C) Western blot analysis of purified recombinant BPS protein as well as whole-cell extracts of GBS and E. coli using BPS antiserum. Lane 1, purified recombinant BPS; lane 2, Compton R; lane 3, 71-735 (serotype III/R1); lane 4, H4A-0126 (type Ia/R1, BPS); lane 5, 76-043 (type III/R4); lane 6, E. coli XL1-Blue expressing BPS; lane 7, E. coli XL1-Blue control.
Article Snippet: The Escherichia coli strains XL1-Blue MRF and XLOLR were obtained from a commercial source (Stratagene).
Techniques: Recombinant, Expressing, Purification, Affinity Chromatography, Staining, Western Blot, Plasmid Preparation, IA