Discovering and Exploiting Selectivity within Tandem Bromodomains

发现和利用串联布罗莫结构域内的选择性

• 批准号: 10580893
• 负责人: Brian Christopher Smith
• 金额: $ 15万
• 依托单位: MEDICAL COLLEGE OF WISCONSIN
• 依托单位国家: 美国
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-09-01 至 2023-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/10580893
• 关键词: 14 year old; Acetylation; Achievement; Acyl Coenzyme A; Acylation; Address; Administrative Supplement; Award; Binding; Binding Proteins; Biochemistry; Biology; Biophysics; Bromodomain; Chemicals; Chromatin; Clinical Trials; Crystallization; DNA Sequence; Diabetes Mellitus; Disease model; Doctor of Philosophy; Enhancers; Epigenetic Process; Faculty; Funding; Genetic; Genetic Transcription; Goals; Histones; Infrastructure; Investments; Lead; Ligands; Link; Location; Lysine; Maintenance; Malignant Neoplasms; Metabolic; Metabolism; Modification; Molecular Conformation; Oncogenic; Parents; Pharmaceutical Preparations; Post-Translational Protein Processing; Proteins; Proteomics; Research; Research Infrastructure; Research Personnel; Roentgen Rays; Role; Specificity; Structure; Supervision; Techniques; Training Support; Wages; Wisconsin; Writing; base; biophysical techniques; combinatorial; cost; human disease; inhibitor; instrument; instrumentation; medical schools; novel; operation; programs; promoter; research facility; scaffold; screening; small molecule; small molecule inhibitor; structural biology; therapeutic target; tool

PROJECT SUMMARY The goal of this administrative supplement request is to provide a state-of-the-art crystallization instrument for structural studies of bromodomain binding to metabolically-derived histone acyl-lysines and small-molecule inhibitors covered by the R35 GM128840 parent award. The role of bromodomain-regulated transcription in human disease is well appreciated with bromodomain inhibitors in clinical trials. Despite these achievements, several critical questions remain. For example, bromodomains are localized disproportionately at super- enhancers. The basis of this localization is unknown but important given that super-enhancers are enriched at loci with oncogenic potential. We hypothesize that tandem bromodomains act as a scaffold for acetylation- dependent chromatin reorganization, for instance, joining promotors with enhancers to drive transcription (Focus 1). We are taking a structural and biophysical approach to investigate the role of tandem bromodomains in maintaining chromatin conformations. We also hypothesize that metabolic changes induce post-translational modifications on histones “read” by bromodomains. Yet, the acylation and protein binding specificity of bromodomains are poorly understood. To address this metabolic question, we use biophysical, structural biology, and proteomic techniques to investigate bromodomain acylation selectivity and link acyl-CoA metabolism with transcription (Focus 2). To aid mechanistic inquiries, we are developing inhibitors of bromodomains using a novel fragment-based NMR screening strategy with a current focus on the PBRM1 bromodomains (Focus 3). These chemical tools will distinguish the differential activities of bromodomains in disease models and lead to therapeutics targeting the PBRM1 axis in cancer. To determine optimal conditions toward x-ray structure determination of bromodomains bound to ligands, the proposed instrumentation provides the necessary platform and infrastructure to screen and automate several orders of magnitude greater than a single dispenser can perform. Furthermore, this screening platform will be used for collaborative projects for the Program in Chemical Biology at the Medical College of Wisconsin (MCW) and open to all MCW investigators. The instrumentation will be installed in the shared crystallization instrumentation room controlled by the Department of Biochemistry. As this instrumentation will replace obsolete 14-year-old instrumentation, this room is equipped with the necessary space and infrastructure for the installation and operation. The instrumentation will be maintained by PhD-level research-track faculty and staff. Consistent with its record of significant investments in biophysical research infrastructure and facilities, MCW has committed funds toward the total cost, space to house the requested instrument, 50% of the expenses for its maintenance, and salary support for training and supervision.

项目总结 这项行政补充请求的目标是提供一种最先进的结晶工具 溴域与代谢衍生的组蛋白酰基赖氨酸和小分子结合的结构研究 R35 GM128840家长奖涵盖的抑制剂。溴结构域调控的转录在蛋白合成中的作用 在临床试验中，溴域抑制剂对人类疾病有很好的认识。尽管取得了这些成就， 还有几个关键问题仍然存在。例如，溴结构域不成比例地定位在超- 增强剂。这种本地化的基础是未知的，但很重要，因为超级增强剂在 具有致癌潜力的基因座。我们假设串联的溴结构域作为乙酰化的支架- 依赖染色质重组，例如，将启动子与增强子连接以驱动转录 (焦点1)。我们正在采用结构和生物物理的方法来研究Tandem的作用 溴域在维持染色质构象中的作用。我们还假设新陈代谢的变化会导致 溴域对组蛋白的翻译后修饰。然而，酰化和蛋白质结合 对溴域的特异性知之甚少。为了解决这个新陈代谢问题，我们使用了生物物理学， 结构生物学和蛋白质组学技术研究溴域酰化选择性和连接酰基辅酶A 新陈代谢与转录(焦点2)。为了帮助机械论的调查，我们正在开发抑制 利用一种新的基于片段的核磁共振筛选策略筛选溴域，目前重点放在PBRM1上 溴域(焦点3)。这些化学工具将区分溴域的不同活性 疾病模型，并导致针对癌症的PBRM1轴的治疗。确定最佳条件 关于与配体结合的溴结构域的X射线结构测定，建议的仪器 提供必要的平台和基础架构来筛选和自动化几个数量级 超过了单个分配器所能完成的任务。此外，该筛选平台将用于协同 威斯康星医学院(MCW)化学生物学课程项目向所有MCW开放 调查人员。仪器将安装在共用的结晶仪器控制室中 由生物化学系提供。由于这种仪器将取代过时的14年前的仪器， 该房间配备了安装和运行所需的空间和基础设施。这个 仪器将由博士级研究轨道教职员工维护。与其记录一致的 在生物物理研究基础设施和设施方面的重大投资，MCW已承诺提供资金 总成本、存放所需仪器的空间、其维护费用的50%以及工资 支持培训和监督。