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A transcriptional activator is a protein (transcription factor) that increases transcription of a gene or set of genes. [1] Activators are considered to have positive control over gene expression, as they function to promote gene transcription and, in some cases, are required for the transcription of genes to occur.
The Ac Activator element is autonomous, whereas the Ds Dissociation element requires an Activator element to transpose. [1] Ac was initially discovered as enabling a Ds element to break chromosomes. Both Ac and Ds can also insert into genes, causing mutants that may revert to normal on excision of the element. [2]
Activator may refer to: Activator (genetics), a DNA-binding protein that regulates one or more genes by increasing the rate of transcription; Activator (phosphor), a type of dopant used in phosphors and scintillators; Enzyme activator, a type of effector that increases the rate of enzyme mediated reactions
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. [1]
Activator protein 1 (AP-1) is a transcription factor that regulates gene expression in response to a variety of stimuli, including cytokines, growth factors, stress, and bacterial and viral infections. [1] AP-1 controls a number of cellular processes including differentiation, proliferation, and apoptosis. [2]
Activation of promoter pRE enables expression of the repressor protein cI, which shuts off all lytic genes. pRE activation is also accompanied with a ~2 fold drop in pR activity due to convergent transcription of the two promoters, decreasing the expression of the lytic genes O and P. [12] Activation of promoter pAQ produces the antisense RNA ...
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In the context of receptor signaling, transactivation occurs when one or more receptors activate yet another; [1] [2] receptor transactivation may result from the crosstalk of signaling cascades or the activation of G protein–coupled receptor hetero-oligomer subunits, among other mechanisms.
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