Comprehensive insights into Mycobacterium tuberculosis DevR (DosR) regulon activation switch

Nucleic Acids Res. 2011 Sep 1;39(17):7400-14. doi: 10.1093/nar/gkr375. Epub 2011 Jun 7.


DevR regulon function is believed to be crucial for the survival of Mycobacterium tuberculosis during dormancy. In this study, we undertook a comprehensive analysis of the DevR regulon. All the regulon promoters were assigned to four classes based on the number of DevR binding sites (Dev boxes). A minimum of two boxes are essential for complete interaction and their tandem arrangement is an architectural hallmark at all promoters. Initial interaction of DevR with the conserved box is essential for its cooperative binding to adjacent sites bearing low to very poor sequence conservation and is the universal mechanism underlying DevR-mediated transcriptional induction. The functional importance of tandem arrangement was established by analyzing promoter variants harboring Dev boxes with altered spacing. Conserved sequence logos were generated from 47 binding sequences which included 24 newly discovered Dev boxes. In each half site of an 18-bp binding motif, G(5) and C(7) are essential for DevR binding. Finally, we show that DevR regulon induction occurs in a temporal manner and genes that are induced early are also usually powerfully induced. The information theory-based approach along with binding and temporal expression studies provide us with comprehensive insights into the complex pattern of DevR regulon activation.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bacterial Proteins / metabolism*
  • Base Sequence
  • Binding Sites
  • Conserved Sequence
  • DNA-Binding Proteins
  • Gene Expression Regulation, Bacterial
  • Mycobacterium tuberculosis / genetics*
  • Nucleotides / analysis
  • Promoter Regions, Genetic*
  • Protein Kinases / metabolism*
  • Regulon*
  • Transcription Factors / metabolism*
  • Transcriptional Activation


  • Bacterial Proteins
  • DNA-Binding Proteins
  • DosR protein, Mycobacterium tuberculosis
  • Nucleotides
  • Transcription Factors
  • Protein Kinases