MBP-EibA fusions. Broth cultures were grown and induced with IPTG, and whole-cell were extracts prepared as described in Materials and Methods. Equivalent amounts of cell extracts were fractionated by SDS-PAGE (8% acrylamide) and blotted to PVDF. The blot was incubated first with human IgG Fc-HRP (A) and second with rabbit anti-MBP developed with donkey anti-rabbit Ig (B) (see Materials and Methods). Lanes: 1, pMal-c2X; 2, EibA (amino acids [aa] 254 to 392), pDC2240; 3, EibA (aa 254 to 344), pDC2283; 4, EibA (aa 300 to 392), pDC2252; 5, EibA (aa 254 to 298), pCS7299; 6, EibF (aa 318 to 459), pCS7280.