Science Fair Project Encyclopedia
Sigma factor
Sigma factor (σ factor) is an initiation factor that binds to RNA polymerase and promotes attachment to promoter sites on DNA.
Structure
Sigma factor has four main regions:
N----------C
1 2 3 4
- Region 1 regulates interaction with DNA.
- Region 2 binds RNAP and binds to the -10 promoter site.
- Region 4 binds to the -35 promoter site.
10-26-2009 08:16:03
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details