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- W932093053 abstract "This chapter provides a review of the current structural and kinetic models for transcription elongation and termination. It describes the regulatory molecules that are known to influence the elongation/termination decision by RNA polymerase (RNAP), with the emphasis on the most recent findings and on the mechanism of ‘‘active’’ regulators whose actions are not limited to changes in RNA folding. Interactions between RNAP and the nucleic acid chains, as well as the RNA:DNA pairing in the hybrid, all contribute to the extraordinary stability of the elongating transcription elongation complexes (TECs). RNA release is triggered at sites where the nascent RNA folds into a stable, GC-rich hairpin followed by a stretch of the U-rich RNA. Rho is the main termination protein in Escherichia coli, where it is thought to control ~ 50% of all termination events. Feedback control of the operons that encode ribosomal protein synthesis is commonly accomplished by autogenous regulation by one of the products. Alc protein terminates transcription at several sites on a nonmodified host DNA, but not on the phage DNA that contains hydroxymethyl cytosine residue. The bgl operon in E. coli is regulated in response to the availability of a substrate β-glucoside by BglG induced antitermination. The RNA binding by BglG is regulated by BglF-mediated phosphorylation: in the absence of inducer, BglF phosphorylates BglG and inhibits its RNA binding activity; when β-glucosides are available, BglF dephosphorylates BglG, which now binds to its target and prevents transcription termination." @default.
- W932093053 created "2016-06-24" @default.
- W932093053 creator A5063187030 @default.
- W932093053 date "2014-04-30" @default.
- W932093053 modified "2023-09-26" @default.
- W932093053 title "Control of Transcription Termination and Antitermination" @default.
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