Materials and Methods

We grew E.Coli DH5a transformed with the plasmid C3 containing the [http://partsregistry.org/Part:BBa_K320001 immunotoxin] with the [http://partsregistry.org/Part:BBa_K320002 strong promoter]([http://partsregistry.org/Part:BBa_K320006 BBa_K320006]). As a negative control we used cultures transformed with the C3 plasmid alone. We harvested a culture volume of 100 ml. The pellets as well as the supernatents were used as samples for a protein analysis. The pellets were resuspended in lysis buffer (prepared as described in the [http://openwetware.org/wiki/Knight:Purification_of_His-tagged_proteins/Denaturing Knight protocol]) containing urea and sonicated for 15 minutes. For the western blot the samples were run on an SDSpage gel and then transferred to a nitrocellulose membrane. The detection was accomplished using the following antibodies: Anti-his biotin as primary and Streptavidin-HPR as a secondary antibody. Additional to the primary antibody we applied Anti-his HRP. The supernatants were run through a filter device with a 5 kDa cutoff (“centricon”). These samples were also anayzed with a western blot as described above.