Download MendeleyTranscription inhibition by the depsipeptide antibiotic salinamide A.
Degen, D., Feng, Y., Zhang, Y., Ebright, K.Y., Ebright, Y.W., Gigliotti, M., Vahedian-Movahed, H., Mandal, S., Talaue, M., Connell, N., Arnold, E., Fenical, W., Ebright, R.H.(2014) Elife 3: e02451-e02451
- PubMed: 24843001
- DOI: https://doi.org/10.7554/eLife.02451
- Primary Citation of Related Structures:
4MEX, 4MEY - PubMed Abstract:
We report that bacterial RNA polymerase (RNAP) is the functional cellular target of the depsipeptide antibiotic salinamide A (Sal), and we report that Sal inhibits RNAP through a novel binding site and mechanism. We show that Sal inhibits RNA synthesis in cells and that mutations that confer Sal-resistance map to RNAP genes. We show that Sal interacts with the RNAP active-center 'bridge-helix cap' comprising the 'bridge-helix N-terminal hinge', 'F-loop', and 'link region'. We show that Sal inhibits nucleotide addition in transcription initiation and elongation. We present a crystal structure that defines interactions between Sal and RNAP and effects of Sal on RNAP conformation. We propose that Sal functions by binding to the RNAP bridge-helix cap and preventing conformational changes of the bridge-helix N-terminal hinge necessary for nucleotide addition. The results provide a target for antibacterial drug discovery and a reagent to probe conformation and function of the bridge-helix N-terminal hinge.DOI: http://dx.doi.org/10.7554/eLife.02451.001.
Organizational Affiliation:
Waksman Institute, Rutgers University, Piscataway, United States.
