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Figure 2 | BMC Microbiology

Figure 2

From: Evaluation of an in silico predicted specific and immunogenic antigen from the OmcB protein for the serodiagnosis of Chlamydia trachomatis infections

Figure 2

Expression and purification of the recombinant proteins and the vector tags. All proteins of interest are indicated with arrows. (A): Immunoblot analysis of the BPT tagged proteins expressed using the PinPoint Xa-1 vector in E. coli BL21 (DE3). Lane 1: molecular weight marker (broad range protein molecular marker, PROMEGA), lane 2: BPT (13 kDa), lane 3: BPT-Nt (24.5 kDa), lane 4: BPT-Ct (18.5 kDa). The star marks an endogenous biotinylated protein of 22.5 kDa expressed in E. coli cells. (B): SDS-PAGE (15%) analysis of GST tagged proteins expressed using the pGEX-6P-1 vector in E. coli BL21 (DE3). Lane 1: molecular weight marker, lane 2: GST (24 kDa), lane 3: GST-Nt (35.5 kDa), lane 4: GST-Ct (29.5 kDa). (C): SDS-PAGE (15%) analysis of the semi purified BPT-Ct by heat treatment. Lane 1: molecular weight marker, lane 2: 40°C 5 min, lane 3: 55°C 5 min, lane 4: 70°C 5 min. (D): SDS-PAGE (15%) analysis of purified GST and GST-Ct. Lane 1: molecular weight marker, lane 2: purified GST, lane 3: purified GST-Ct.

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