Structure and Function of the Bacterial Primosome

细菌初级体的结构和功能

• 批准号: 10205080
• 负责人: James L Keck
• 金额: $ 27.77万
• 依托单位: UNIVERSITY OF WISCONSIN-MADISON
• 依托单位国家: 美国
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-09-30 至 2022-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/10205080
• 关键词: Antibiotics; Bacteria; Binding Proteins; Biochemical Genetics; Biochemistry; Biological; Cells; Complex; Cryoelectron Microscopy; Crystallization; DNA; DNA Double Strand Break; DNA Repair; DNA Structure; DNA biosynthesis; DNA replication fork; Data; Disease; DnaB helicase; Ensure; Escherichia coli; Genes; Genetic; Genome; Genomics; Goals; Health; Human; Individual; Knowledge; Life; Link; Longevity; Maintenance; Malignant - descriptor; Malignant Neoplasms; Maps; Mediating; Molecular; Organism; Pathogenicity; Pathway interactions; Plague; Process; Proteins; Reaction; Regulation; Research; Role; Site; Structure; Translating; crosslink; design; experimental study; gene function; genetic approach; helicase; in vivo; premature; programs; protein complex; recombinational repair; repaired; structural biology; tumor

DNA replication restart pathways reload cellular DNA replication complexes onto replication forks that have been prematurely abandoned. These pathways form an essential link between DNA repair (often recombinational repair) and replication. The proteins that drive these reactions, referred to as the primosome or the Replication Restart Proteins, must recognize the structures of abandoned replication forks and reload the DNA replication machinery specifically at these sites. This process is heavily regulated to ensure loading fidelity and to avoid over-replication that could arise from initiating replication at improper DNA structures. In spite of the broad biological importance of this process, the mechanisms underlying DNA replication restart and its regulation remain poorly understood. Additionally, the mechanisms by which replication restart pathways are integrated with core cellular DNA repair processes are currently unknown. Our proposal combines structural, biochemical, and genetic approaches to define the mechanisms of DNA replication restart in complementary ways. Our first overall objective of this application is to determine the structural mechanisms that govern DNA replication restart, from recognition of abandoned DNA replication forks, to primosome assembly, and finally to reloading the first component of the DNA replication machinery. Aim 1 takes advantage of our preliminary data to define structural snapshots of each step in DNA replication restart. Our second goal is to systematically define the genetic mechanisms that support DNA replication restart. Aim 2 will identify the genes that coordinate double-strand DNA break repair with replication restart and will define circumstances under which the major replication restart pathways are utilized in cells. Additionally, the mechanisms underlying replication restart suppressors will be examined.

DNA复制重新启动途径将细胞DNA复制复制复合物重新复制到复制 过早废弃的叉子。这些途径在 DNA修复（通常是重组修复）和复制。驱动这些蛋白质的蛋白质 反应，称为原始体或复制重新启动蛋白质，必须识别 废弃复制叉的结构并重新加载DNA复制机械 特别是在这些站点。此过程受到严格的监管，以确保加载忠诚度和 避免因在不当DNA结构上启动复制而产生的过度复制。在 该过程的生物学重要性广泛，即DNA的基础机制 复制重新启动及其规定仍然很少理解。另外，该机制通过 哪些复制重新启动途径与核心细胞DNA修复过程集成在一起 目前未知。我们的建议结合了结构，生化和遗传方法 以互补的方式定义DNA复制的机制。我们的第一个整体 该应用的目的是确定控制DNA的结构机制 复制重新开始，从识别废弃的DNA复制叉到原始体 组装，最后重新加载DNA复制机制的第一个组件。目标1 利用我们的初步数据来定义DNA中每个步骤的结构快照 复制重新启动。我们的第二个目标是系统地定义 支持DNA复制重新启动。 AIM 2将识别协调双链DNA的基因 重新启动重新修复，并将定义专业的情况 复制重新启动途径用于细胞中。此外，机制 将检查复制重新启动抑制器。