Abstract: Brucella abortus ribosomal L7/L12 protein is a 12 kDa protein encoded by rplL. This gene was amplified by PCR from B. abortus S19 and cloned in pET16b expression vector. The construct was transformed in Escherichia coli BL21 (DE3) PlysS. The expression was performed by addition 1 mM IPTG (isopropyl-beta-D-thiogalacto- pyranoside) in the medium with OD = 0.6 and incubation continued for 1, 2, 4 and 8 h at 37°C. The highest production (23 mg L-1) level was achieved after 4 h incubation of induction. The recombinant protein was purified by Ni-NTA column and characterized by SDS-PAGE.