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. 1996 Jun 17;15(12):3093–3104.

Human TAF(II28) promotes transcriptional stimulation by activation function 2 of the retinoid X receptors.

M May 1, G Mengus 1, A C Lavigne 1, P Chambon 1, I Davidson 1
PMCID: PMC450252  PMID: 8670810

Abstract

Transcriptional activation in vitro involves direct interactions of transactivators with the TATA binding protein (TBP) and the TBP-associated factors (TAF(II)s) which constitute the TFIID complex. However, the role of TAF(II)s in transcriptional regulation in mammalian cells has not been addressed. We show that activation function 2 of the retinoid X receptors (RXR AF-2) does not activate transcription from a minimal promoter in Cos cells. However, coexpression of human (h) TAF(II)28 promotes a strong ligand-dependent activity of the RXR AF-2 on a minimal promoter and potentiates the ability of the RXRalpha AF-2 to activate transcription from a complex promoter. The expression of hTAF(II)28 also potentiated transactivation by several nuclear receptors, notably the oestrogen and vitamin D3 receptors (ER and VDR), whereas other classes of activator were not affected. The effect of hTAFII(28) on RXR AF-2 activities did not appear to require direct RXR-TAFII(28) interactions, but correlated with the ability of hTAFII(28) to interact with TBP. In contrast to Cos cells, the RXR AF-2s had differential abilities to activate transcription from a minimal promoter in HeLa cells, and a lesser increase in their activity was observed upon hTAFII28 coexpression. Moreover, coexpression of hTAFII(28) did not increase but rather repressed activation by the ER and VDR AF-2s in HeLa cells. In agreement with these data, showing that TAF(II)28 is limiting in the AF-2 activation pathway in Cos cells, TAF(II)28 is selectively depleted in Cos cell TFIID.

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