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- W1985890646 abstract "Two types of sites are known to cause pausing and/or termination by bacteriophage T7 RNA polymerase (RNAP). Termination at class I sites (typified by the signal found in the late region of T7 DNA, TΦ) involves the formation of a stable stem-loop structure in the nascent RNA ahead of the point of termination, and results in termination near runs of U. Class II sites, typified by a signal first identified in the cloned human preproparathyroid hormone (PTH) gene, generate no evident structure in the RNA but contain a conserved sequence ahead of the point of termination, and also contain runs of U. Termination at class I and class II sites may involve non-equivalent mechanisms, as mutants of T7 RNA polymerase have been identified that fail to recognize class II sites yet continue to recognize class I sites. In this work, we have analyzed pausing and termination at several class II sites, and variants of them. We conclude that the 7 bp sequence ATCTGTT (5′ to 3′ in the non-template strand) causes transcribing T7 or T3 RNA polymerase to pause. Termination 6 to 8 bp past this sequence is favored by the presence of runs of U, perhaps because they destabilize an RNA:DNA hybrid. The effects of T7 lysozyme on pausing and termination are consistent with the idea that termination involves a reversion of the polymerase from the elongation to the initiation conformation, and that lysozyme inhibits the return to the elongation conformation. A kinetic model of pausing and termination is presented that provides a consistent interpretation of our results." @default.
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- W1985890646 date "1998-07-01" @default.
- W1985890646 modified "2023-10-14" @default.
- W1985890646 title "Pausing and termination by bacteriophage T7 RNA polymerase" @default.
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- W1985890646 doi "https://doi.org/10.1006/jmbi.1998.1854" @default.
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