Allosteric modulation of the RNA polymerase catalytic reaction is an essential component of transcription control by rifamycins.
Artsimovitch, I., Vassylyeva, M.N., Svetlov, D., Svetlov, V., Perederina, A., Igarashi, N., Matsugaki, N., Wakatsuki, S., Tahirov, T.H., Vassylyev, D.G.(2005) Cell 122: 351-363
- PubMed: 16096056 
- DOI: 10.1016/j.cell.2005.07.014
- Primary Citation of Related Structures:  
2A68, 2A69, 2A6E - PubMed Abstract: 
Rifamycins, the clinically important antibiotics, target bacterial RNA polymerase (RNAP). A proposed mechanism in which rifamycins sterically block the extension of nascent RNA beyond three nucleotides does not alone explain why certain RNAP mutations confer resistance to some but not other rifamycins ...