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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.
[2] The SOS response is a global response to DNA damage in which the cell cycle is arrested and DNA repair and mutagenesis are induced. The system involves the RecA protein (Rad51 in eukaryotes). The RecA protein, stimulated by single-stranded DNA, is involved in the inactivation of the repressor of SOS response genes thereby inducing the ...
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.
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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Depletion of inorganic phosphate within the cell is required for activation of the Pho regulon in most prokaryotes.In the most commonly studied bacterium, E. coli, seven total proteins are used to detect intracellular levels of inorganic phosphate along with transfusing that signal appropriately. [2]
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