Polymerase coordination at the Pol III replication fork

Pol III 复制叉上的聚合酶协调

• 批准号: 6769928
• 负责人: MOLLY CHIARAMONTE
• 金额: $ 4.73万
• 依托单位: UNIVERSITY OF COLORADO DENVER
• 依托单位国家: 美国
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-07-01 至 2006-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6769928
• 关键词: DNA directed DNA polymerase; DNA replication; DNA replication origin; biological signal transduction; enzyme activity; molecular biology; postdoctoral investigator

DESCRIPTION (provided by applicant): The successful duplication of genomic information is essential for cell division and viral propagation. Research that deepens our understanding of genomic replication is crucial for advance in the treatment of cancer as well as infection by bacteria, parasites, and viruses. The bacterium Escherichia coli (E. coli) is a model system for studying DNA replication due to its ease of handling and genetic manipulation, the large amount of information available about this organism, and its many mechanistic similarities with eukaryotic replication systems. The E. coli replicase, DNA Pol III holoenzyme, is composed of 10 different protein subunits. While the stoichiometry, placement, and general function have been determined for many subunits, the significance of dynamic interactions between subunits has yet to be fully understood. The goal of the research proposed here is to further elucidate the communication mechanisms within the DNA Pol III replicase that affect coordination of the leading and lagging strand polymerases at the replication fork. A reconstituted DNA replication system will be used in conjunction with BIAcore biosensor and fluorescence anisotropy techniques to identify the effectors that signal polymerase cycling on the lagging strand. The rates at which different signaling mechanisms cause polymerase dissociation from DNA will be measured in order to determine their physiological relevance. Additionally, communication between the two polymerases at the replication fork will be studied using a novel rolling circle replication system in which the affects on leading strand synthesis can be measured while the behavior of the lagging strand polymerase is varied.

描述（由申请人提供）：基因组信息的成功复制对于细胞分裂和病毒繁殖至关重要。加深我们对基因组复制的理解的研究对于癌症治疗以及细菌，寄生虫和病毒感染的进展至关重要。大肠杆菌（Escherichia coli，E.大肠杆菌）是研究DNA复制的模型系统，这是由于其易于处理和遗传操作、关于该生物体的大量可用信息以及其与真核复制系统的许多机制相似性。急诊大肠杆菌复制酶（DNA Pol III全酶）由10个不同的蛋白质亚基组成。虽然化学计量，位置，和一般功能已被确定为许多亚基，亚基之间的动态相互作用的意义尚未得到充分理解。本文提出的研究目标是进一步阐明DNA Pol III复制酶内影响复制叉处前导链和滞后链聚合酶协调的通信机制。重组DNA复制系统将与BIAcore生物传感器和荧光各向异性技术结合使用，以鉴定在滞后链上发出聚合酶循环信号的效应物。将测量不同信号传导机制导致聚合酶从DNA解离的速率，以确定其生理相关性。此外，在复制叉的两个聚合酶之间的通信将使用一种新的滚环复制系统，其中可以测量的影响，而滞后链聚合酶的行为是不同的。