1998年の論文ですが、T7プロモーター領域がダブルストランドであればTranscriptionが始まれば一本鎖でもT7 Polymeraseは走るというデーターはあるようですが、一本鎖ではT7 Polymeraseが安定化しないという話もあり、条件や配列によるのかもしれませんね。
http://www.jbc.org/content/273/17/10253.full#ref-29
The non-template (NT) strand of the DNA does not appear to be required for initiation or for the early stages of transcription, ... Milligan et al. (7) have shown that the enzyme can transcribe a single-stranded DNA template once it has initiated transcription from a double-stranded promoter.
However, Zhouet al. (16, 17) have suggested that the stability of the EC may require the presence of duplex DNA at the leading edge of the elongation complex, as an elongation complex that is halted just upstream from a region in which the NT strand is missing appears to be unable to resume transcription. |
|