Research Article

The Expression of Soluble and Active Recombinant Haemophilus influenzae IgA1 Protease in E. coli

Figure 3

pCold-IGAN IgA1 proteases were expressed as soluble proteins in E. coli. The expressions of pCold-IGAN cell strains were induced at 12°C with 0.4 mM IPTG for 18 hours. The cell pellets were lysed and centrifuged. The total cell lysates and soluble supernatants were analyzed with SDS-PAGE (reduced condition) and Western blot.
253983.fig.003a
(a) Coomassie blue stain
253983.fig.003b
(b) Western blot with anti-His Ab