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We have identified a mutation (E148A) in T7 RNA polymerase (RNAP) that results in an enzyme which aborts transcription primarily when the nascent RNA achieves a length of 5 nt. This phenomenon is observed at a consensus promoter, but is even more strongly observed at promoters that are altered in the initiation region. Although the abortive product is of a fixed length (5 nt), the positions of the...
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