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Mol Endocrinol. 1998 Jul;12(7):1038-47.

Molecular cloning of xSRC-3, a novel transcription coactivator from Xenopus, that is related to AIB1, p/CIP, and TIF2.

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College of Pharmacy, Chonnam National University, Kwangju, South Korea.


Nuclear receptors regulate transcription by binding to specific DNA response elements of target genes. Herein, we report the molecular cloning and characterization of a novel Xenopus cDNA encoding a transcription coactivator xSRC-3 by using retinoid X receptor (RXR) as a bait in the yeast two-hybrid screening. It belongs to a growing coactivator family that includes a steroid receptor coactivator amplified in breast cancer (AIB1), p300/ CREB-binding protein (CBP)-interacting protein (p/ CIP), and transcriptional intermediate factor 2 (TIF2). It also interacts with a series of nuclear receptors including retinoic acid receptor (RAR), thyroid hormone receptor (TR), and orphan nuclear receptors [hepatocyte nuclear receptor 4 (HNF4) and constitutive androstane receptor (CAR)]. However, it does not interact with small heterodimer partner (SHP), an orphan nuclear receptor known to antagonize ligand-dependent transactivation of other nuclear receptors. In CV-1 cells, cotransfection of xSRC-3 differentially stimulates ligand-induced transactivation of RXR, TR, and RAR in a dose-dependent manner. Interestingly, xSRC-3 is highly expressed in adult liver and early stages of oocyte development, suggesting that studies of xSRC-3 may lead to better understanding of the roles nuclear receptors play in oocyte development as well as liver-specific gene expression.

[Indexed for MEDLINE]

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