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Example sentences for: af-
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The fact that the mode of ERβ interaction with N-CoR resembles that of NRs with coactivators [ 4 ] , or with corepressors that modulate the activity of liganded NR complexes, such as RIP140 [ 10 ] , raises the possibility that ERβ may be able to recruit N-CoR and SMRT to estrogen-regulated promoters in response to agonists and that the balance of overall ERβ activity in the presence of estrogens may be regulated by competition between p160s and corepressors for the same ERβ AF-2 surface.
These cofactors interact with nuclear receptors in a ligand-dependent manner and enhance transcriptional activation via histone acetylation/methylation and recruitment of additional cofactors such as CBP/p300 [ 89 ] . CBP/p300 has been implicated in the functions of a large number of regulated transcription factors based primarily on physical interaction and the ability to potentiate transcription when overexpressed [ 90 ] . In the case of nuclear receptors, the interaction with CBP/p300 is ligand-dependent and relies on the conserved nuclear receptor functional domain, AF-2 (activation function 2).
AF-1 Activation function 1
Moreover, this interaction is dependent upon ERβ AF-2, including H12, and is competed by NR box peptides but not ID peptides.
In the case of the RARγ2, degradation requires a constitutive phosphorylation of the AF-1 domain, heterodimerisation with RXR, and the presence of ligand indicating that the receptor has to be transcriptionally active to be degraded [ 42].