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Activating signal cointegrator 1, a novel transcription coactivator of nuclear receptors, and its cytosolic localization under conditions of serum deprivation. 下载免费PDF全文
Han-Jong Kim Ji-Young Yi Hee-Sook Sung David D. Moore Byung Hak Jhun Young Chul Lee Jae Woon Lee 《Molecular and cellular biology》1999,19(9):6323-6332
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Peptidyl-prolyl isomerase 1 (Pin1) serves as a coactivator of steroid receptor by regulating the activity of phosphorylated steroid receptor coactivator 3 (SRC-3/AIB1) 总被引:4,自引:0,他引:4 下载免费PDF全文
Yi P Wu RC Sandquist J Wong J Tsai SY Tsai MJ Means AR O'Malley BW 《Molecular and cellular biology》2005,25(21):9687-9699
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We described previously a novel role for cyclin A2/Cdk2 as a progesterone receptor (PR) coactivator. In reporter gene assays, cyclin A2 overexpression enhanced PR activity while inhibition of Cdk2 activity using the chemical inhibitor roscovitine or Cdk2 siRNA strongly inhibited PR activity. We demonstrate here that both Cdk1 and Cdk2 contribute to maximal induction of endogenous progestin responsive genes in T47D breast cancer cells. Our earlier studies suggested that the mechanism by which cyclin A2/Cdk2 enhances PR activity is via phosphorylation of steroid receptor coactivator-1 (SRC-1), which increases PR-SRC-1 interactions. To assess the importance of SRC-1 phosphorylation in the regulation of PR activity, SRC-1 was phosphorylated by cyclin A2/Cdk2 in vitro and seventeen phosphorylation sites were identified using biochemical techniques. We show that one of these sites, T1426 (adjacent to the C-terminal LXXLL nuclear receptor interaction motif), is an in vivo target of Cdks in mammalian cells and an in vitro target of Cdk1 and Cdk2. Phosphorylation of T1426 also contributes to SRC-1 coactivation potential, as mutation of the threonine target site to alanine results in reduced stimulation of PR activity by SRC-1. Together, these results suggest a role for Cdk1 and Cdk2 in the regulation of endogenous PR activity in part through phosphorylation of SRC-1. 相似文献
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Steroid receptor coactivator 1 links the steroid and interferon gamma response pathways 总被引:2,自引:0,他引:2
Tzortzakaki E Spilianakis C Zika E Kretsovali A Papamatheakis J 《Molecular endocrinology (Baltimore, Md.)》2003,17(12):2509-2518
We show here that steroid receptor coactivator 1 (SRC-1) is a coactivator of MHC class II genes that stimulates their interferon gamma (IFNgamma) and class II transactivator (CIITA)-mediated expression. SRC-1 interacts physically with the N-terminal activation domain of CIITA through two regions: one central [extending from amino acids (aa) 360-839] that contains the nuclear receptors binding region and one C-terminal (aa 1138-1441) that contains the activation domain 2. Using chromatin immunoprecipitation assays we show that SRC-1 recruitment on the class II promoter is enhanced upon IFNgamma stimulation. Most importantly, SRC-1 relieves the inhibitory action of estrogens on the IFNgamma-mediated induction of class II genes in transient transfection assays. We provide evidence that inhibition by estradiol is due to multiple events such as slightly reduced recruitment of CIITA and SRC-1 and severely inhibited assembly of the preinitiation complex. 相似文献
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