The genes were cloned downstream of the aadA gene and flanked by 5′UTR from rrn16S and a 3′UTR from rbcl, for mRNA stabilization and to enhance gene translation [50].Both promoter and terminator were synthetic and obtained from Kuroda and Maliga [37] performing point mutations in the 1216 bp corresponding at 3′UTR to eliminate the XbaI site (Fig. 1a and Fig. 1b).