Abstract：
:Streptolydigin (Stl) is a potent inhibitor of bacterial RNA polymerases (RNAPs). The 2.4 A resolution structure of the Thermus thermophilus RNAP-Stl complex showed that, in full agreement with the available genetic data, the inhibitor binding site is located 20 A away from the RNAP active site and encompasses the bridge helix and the trigger loop, two elements that are considered to be crucial for RNAP catalytic center function. Structure-based biochemical experiments revealed additional determinants of Stl binding and demonstrated that Stl does not affect NTP substrate binding, DNA translocation, and phosphodiester bond formation. The RNAP-Stl complex structure, its comparison with the closely related substrate bound eukaryotic transcription elongation complexes, and biochemical analysis suggest an inhibitory mechanism in which Stl stabilizes catalytically inactive (preinsertion) substrate bound transcription intermediate, thereby blocking structural isomerization of RNAP to an active configuration. The results provide a basis for a design of new antibiotics utilizing the Stl-like mechanism.
journal_name
Mol Celljournal_title
Molecular cellauthors
Temiakov D,Zenkin N,Vassylyeva MN,Perederina A,Tahirov TH,Kashkina E,Savkina M,Zorov S,Nikiforov V,Igarashi N,Matsugaki N,Wakatsuki S,Severinov K,Vassylyev DGdoi
10.1016/j.molcel.2005.07.020subject
Has Abstractpub_date
2005-09-02 00:00:00pages
655-66issue
5eissn
1097-2765issn
1097-4164pii
S1097-2765(05)01508-Xjournal_volume
19pub_type
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