Immune reactivity of sera obtained from brucellosis patients and vaccinated-rabbits to a fusion protein from Brucella melitensis

Document Type : Original Article


1 Applied Microbiology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran

2 Molecular Biology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran

3 Monoclonal Antibody Research Center, Avicenna Research Institute, ACECR, Tehran, Iran


Objective(s): Brucella spp. are facultative intracellular pathogens which can stay alive and multiply in professional and nonprofessional phagocytes. Immunity against Brucella melitensis involves antigen-specific CD4+ and CD8+ T-cells activation and humoral immune responses. Due to negative aspects of live attenuated vaccines, much attention has been focused on finding Brucella-protective antigens to introduce them as potential subunit vaccine candidates.
Materials and Methods: A chimeric gene encoding trigger factor (TF), Omp3148-74 and BP2687-111 fragments (TOB) from B. melitensis was successfully cloned, expressed in Escherichia coliBL21-DE3 and purified by Ni-NTA agarose column. Antibodies to recombinant TOB (rTOB) have been investigated in Brucella-infected human sera and a pool serum prepared from B. melitensis-vaccinated rabbits.
Results: Our results showed that the immunized rabbit pool serum strongly reacted with rTOB. In addition, antibodies against rTOB were detectable in 76.5% of sera obtained from infected patients.
Conclusion: These findings suggest that rTOB may provide a potential immunogenic candidate which could be considered in future vaccine studies.


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