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P27 is an antigenic membrane lipoprotein synthesized by members of the Mycobacterium tuberculosis complex. Northern blotting and RT-PCR experiments indicated that the genes encoding P27 and a putative antibiotic transporter (P55) form an operon. A promoter region was identified and characterized by deletion analysis in Mycobacterium smegmatis. Two transcription initiation points were mapped in Mycobacterium bovis BCG by primer extension analysis to 76 bp and 87 bp upstream of the ATG initiation codon. Putative -10 and -35 promoter consensus sequences associated with these showed 66% similarity to previously identified mycobacterial promoters. These results suggest that the P27/P55 operon is transcribed from two promoters in M. bovis BCG.

The gene encoding P27 lipoprotein and a putative antibiotic-resistance gene form an operon in Mycobacterium tuberculosis and Mycobacterium bovis