Role of Allostery in CAR Transactivation

CAR的结构与功能研究 该项目的主要目标是确定 组成型雄烷受体（CAR）。CAR在清除 外源性物质和内源性毒素如胆红素。汽车属于核 介导内分泌功能的转录因子蛋白受体家族 并在发育、生理学和药理学中发挥关键作用。的 核受体的功能活性由小分子激素调节 和合成分子。CAR受小分子信号调节。此前我们 利用多种生物物理和基于细胞的 分析显示不同的变构途径如何微调的活性， 核受体我们的目标是识别和区分 由配体、DNA和辅因子如辅- 激活子和辅抑制子。我们将结合晶体学和 生物物理技术来确定本地和远程构象变化 发生在配体结合时。与沈同业博士一起，我们将使用理论 预测变构途径的技术，可以进一步表征为 实验技术我们还将在胶原硼化中使用基因组方法 与Rachel Patton McCord博士一起确定体内变构的作用。的 这项研究的最终目标是发展我们对CAR和核武器的理解。 受体。核受体功能障碍与几种疾病有关 状态，CAR活性与肝脏的发育相关 小鼠模型中的肿瘤。概括而言，我们将讨论以下问题：（i） 配体、DNA和共调节分子之间有哪些构象通路？（二） 这些通路如何调节辅激活因子和DNA识别？(iii)是什么 在CAR中变构的基因组规模的影响？因此，详细了解 这些蛋白质和CAR将使我们能够在长期内开发出有效的治疗方法。 term.

Structure-Function Studies on CAR The primary goal of this project is to determine the mechanisms of action of the constitutive androstane receptor (CAR). CAR plays key roles in the clearance of xenobiotics and endogenous toxins such as bilirubin. CAR belongs to the nuclear receptor family of transcription factor proteins that mediate endocrine function and play critical roles in development and physiology and pharmacology. The functional activity of nuclear receptors is regulated by small molecular hormonal and synthetic molecules. CAR is regulated by small-molecule signals. Earlier, we produced preliminary evidence utilizing multiple biophysical and cell-based assays to show how distinct allosteric pathways can fine-tune the activity of nuclear receptors. Our goal here is to identify and distinguish between the different allosteric pathways initiated by ligands, DNA and cofactors such as co- activators and co-repressors. We will use a combination of crystallography and biophysical techniques to determine the local and distant conformational changes that occur upon ligand binding. With Dr. Tongye Shen we will use theoretical techniques to predict allosteric pathways that can be further characterized by experimental techniques. We will also use genomic approaches in colla boration with Dr. Rachel Patton McCord to determine the role of allostery, in vivo. The ultimate goal of this study is to develop our understanding of CAR and nuclear receptors. Malfunctioning nuclear receptors are associated with several disease states, and CAR activity has been associated with the development of liver tumors in mouse models. In summary, we will address the following questions: (i) What conformational pathways link ligand, DNA and coregulatory molecules? (ii) How do these pathways regulate coactivator and DNA recognition? (iii) What is the genome-scale impact of allostery in CAR? Thus, a detailed understanding of these proteins, and CAR, will enable us to develop efficient therapies in the long term.