Abstract
Bacterial RNA polymerase is a common target for many antibiotics. In two recent papers in Cell and Molecular Cell, and describe a structural basis for inhibition of bacterial RNA polymerase by the antibiotic streptolydigin. Streptolydigin may prevent distortion of a "bridge" alpha helix postulated to occur during the nucleotide addition cycle of RNA polymerase or may block a small movement of the bridge helix that helps load nucleotide triphosphates into the active site.
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