The crystal structure of the intact E. coli RelBE toxin-antitoxin complex provides the structural basis for conditional cooperativity.
Boggild, A., Sofos, N., Andersen, K.R., Feddersen, A., Easter, A.D., Passmore, L.A., Brodersen, D.E.(2012) Structure 20: 1641-1648
- PubMed: 22981948 
- DOI: 10.1016/j.str.2012.08.017
- Primary Citation of Related Structures:  
4FXE, 4FXH, 4FXI - PubMed Abstract: 
The bacterial relBE locus encodes a toxin-antitoxin complex in which the toxin, RelE, is capable of cleaving mRNA in the ribosomal A site cotranslationally. The antitoxin, RelB, both binds and inhibits RelE, and regulates transcription through operator binding and conditional cooperativity controlled by RelE ...