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The Ada regulon in E. coli is a well-characterized example of a group of genes involved in the adaptive response form of DNA repair. [ 6 ] Quorum sensing behavior in bacteria is a commonly cited example of a modulon or stimulon, [ 7 ] though some sources describe this type of intercellular auto-induction as a separate form of regulation.
An operon with several promoters located near each other may also have dual binding sites, indicating that such a site can activate one particular promoter, but repress a second one. In the same page, the collection of the different TUs is displayed below the operon.
The Nif regulon is a set of seven operons used to regulate nitrogen fixation in the coliform bacterium Klebsiella pneumoniae under anaerobic and microaerophilic conditions. [1] It includes 17 nif genes , and is situated between the his and the Shi-A operon of the bacterium.
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A typical operon. In genetics, an operon is a functioning unit of DNA containing a cluster of genes under the control of a single promoter. [1] The genes are transcribed together into an mRNA strand and either translated together in the cytoplasm, or undergo splicing to create monocistronic mRNAs that are translated separately, i.e. several strands of mRNA that each encode a single gene product.
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The gal operon contains two operators, O E (for external) and O I (for internal). The former is just upstream of the promoter, and the latter is just after the galE gene (the first gene in the operon). These operators bind the repressor, GalR, which is encoded from outside the operator region. For this repressor protein to function properly ...
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