EspR, a key regulator of Mycobacterium tuberculosis virulence, adopts a unique dimeric structure among helix-turn-helix proteins.
Rosenberg, O.S., Dovey, C., Tempesta, M., Robbins, R.A., Finer-Moore, J.S., Stroud, R.M., Cox, J.S.(2011) Proc Natl Acad Sci U S A 108: 13450-13455
- PubMed: 21795602 
- DOI: 10.1073/pnas.1110242108
- Primary Citation of Related Structures:  
3R1F - PubMed Abstract: 
EspR is a transcriptional regulator that activates the ESX-1 secretion system during Mycobacterium tuberculosis infection and is critical for pathogenesis. It is unique among DNA-binding proteins as it is secreted as part of a feedback regulatory loop that serves to mitigate transcriptional activity ...