Figure 4From: Molecular characterization of the Corynebacterium pseudotuberculosis hsp60-hsp10 operon, and evaluation of the immune response and protective efficacy induced by hsp60 DNA vaccination in miceExpression of C. pseudotuberculosis Hsp60 protein and complementation assays. a) Expression of C. pseudotuberculosis Hsp60 protein in E. coli groEL44 mutant transformed with the recombinant vector pProEx-Hta:hsp60 (groEL44[pProEx-Hta/hsp60]); E. coli wild-type and mutant transformed with the empty vector (B178[pProEX-Hta] and groEL44[pProEX-Hta], respectively) were used as negative controls. Expression of recombinant protein was analyzed at 0, 20, 40 and 60 min after induction with IPTG. The rectangle indicates the protein expressed; b) Complementation assay after thermal stress. The growth of E. coli wild-type (B178[pProEX-Hta]), groEL44 mutant (groEL44[pProEX-Hta] and groEL44[pProEx-Hta/hsp60]) were evaluated. Cultures were serially diluted (10-1 to 10-6), spotted onto the surface of LB agar plates (with and without 1 mM IPTG), and incubated at 30 or 42°C for 18 h; c) Complementation analysis of growth of the γc Ib2 phage in E. coli groEL44 mutant. The growth of the phage was evaluated in E. coli wild-type (B178[pProEX-Hta]) and groEL44 mutant (groEL44[pProEX-Hta] and groEL44[pProEx-Hta/hsp60]). The cultures induced with IPTG, plated at the dilutions from10-1 to 10-4, were incubated at 30°C for 18 h.Back to article page