Molecular Characterization of the eis Promoter of Mycobacterium tuberculosis
Open Access
- 15 August 2004
- journal article
- Published by American Society for Microbiology in Journal of Bacteriology
- Vol. 186 (16), 5410-5417
- https://doi.org/10.1128/jb.186.16.5410-5417.2004
Abstract
To further understand Mycobacterium tuberculosis pathogenesis, the regulation of potential virulence genes needs to be investigated. The eis gene of M. tuberculosis H37Rv enhances the intracellular survival of Mycobacterium smegmatis , which does not contain eis , within macrophages (J. Wei, J. L. Dahl, J. W. Moulder, E. A. Roberts, P. O'Gaora, D. B. Young, and R. L. Friedman, J. Bacteriol. 182: 377-384, 2000). Experiments were done to characterize the eis promoter in M. smegmatis and M. tuberculosis H37Ra. The putative −10 and −35 regions matched the Escherichia coli σ 70 consensus 67 and 83%, respectively, making it a group A/ SigA -like mycobacterial promoter. Expression of site-directed variants of the core promoter region, determined by flow cytometry using gfp as a reporter, showed that the putative −10 region is essential for eis expression. In addition, site-directed alteration of the eis promoter to the consensus E. coli σ 70 promoter elements increased gfp transcription to levels similar to that driven by the heat shock promoter, p hsp60 , of Mycobacterium bovis BCG. Upstream promoter deletion analysis showed that a 200- and 412-bp region of the promoter was necessary for maximum expression of gfp in M. smegmatis and M. tuberculosis H37Ra, respectively. Random mutagenesis of the 412-bp eis promoter, using a catechol 2,3-dioxygenase screen and activity assay, defined nucleotides upstream of the core promoter region that are essential to eis expression in both M. smegmatis and M. tuberculosis H37Ra, including a region homologous to a DinR cis element.Keywords
This publication has 34 references indexed in Scilit:
- Regulation of Expression of mas and fadD28 , Two Genes Involved in Production of Dimycocerosyl Phthiocerol, a Virulence Factor of Mycobacterium tuberculosisJournal of Bacteriology, 2002
- Whole-Genome Comparison ofMycobacterium tuberculosisClinical and Laboratory StrainsJournal of Bacteriology, 2002
- Mycobacterium tuberculosis Genes Induced during Infection of Human MacrophagesInfection and Immunity, 2002
- Human Macrophage Gamma Interferon Decreases Gene Expression but Not Replication ofMycobacterium tuberculosis: Analysis of the Host-Pathogen Reciprocal Influence on Transcription in a Comparison of Strains H37Rv and CMT97Infection and Immunity, 2001
- Subcellular Localization of the Intracellular Survival-Enhancing Eis Protein of Mycobacterium tuberculosisInfection and Immunity, 2001
- TheMycobacterium marinumG13 promoter is a strong sigma 70-like promoter that is expressed inEscherichia coliand mycobacteria speciesFEMS Microbiology Letters, 1999
- Deciphering the biology of Mycobacterium tuberculosis from the complete genome sequenceNature, 1998
- Characterization of Mycobacterium tuberculosis LexA: recognition of a Cheo (Bacillus-type SOS) boxMicrobiology, 1997
- Electroporation at elevated temperatures substantially improves transformation efficiency of slow-growing mycobacteriaFEMS Microbiology Letters, 1996
- Genetic analysis of superoxide dismutase, the 23 kilodalton antigen of Mycobacterium tuberculosisMolecular Microbiology, 1991