Differential expression of two members of Rv1922-LipD operon in Mycobacterium tuberculosis: Does rv1923 qualify for membership?

• Published in: Pathogens and disease Vol. 73; no. 5
• Main Authors: Dogra, Nandita, Arya, Stuti, Singh, Kashmir, Kaur, Jagdeep
• Format: Journal Article
• Language: English
• Published: United States Oxford University Press 01.07.2015
• Subjects: Aerobiosis; Bacterial Proteins - biosynthesis; Bacterial Proteins - genetics; Computational Biology; Gene Expression Regulation, Bacterial; Genes, Bacterial; Mycobacterium tuberculosis - genetics; Operon; Oxidative Stress; Regulatory Sequences, Nucleic Acid; Tuberculosis; stress; promoter; lipases; gene expression
• ISSN: 2049-632X; 2049-632X
• DOI: 10.1093/femspd/ftv029

rv1922 and rv1923 (lipD) are members of Rv1922-LipD operon in the genome of Mycobacterium tuberculosis. rv1922 was expressed under aerobic and stress conditions, whereas rv1923 was not expressed in aerobically grown bacteria but expressed moderately under oxidative stress conditions. Different expression of both the operonic genes under normal and stress conditions posed apprehensions for the inclusion of rv1922 and rv1923 in the same operon. The results from this study indicated that although the genes were expressed in an operonic manner, there existed the possibility of differential regulation for rv1923 which has been supported by in silico analysis for the presence of putative internal regulatory sites in the operon. This article is a first-time report explaining the stress-specific induction of LipD gene expression in comparison to its upstream gene rv1922 of Rv1922-LipD operon, to which both belong.