ANALYSIS OF CALI EXPERIMENTS WITH VIRTUAL CELL

虚拟细胞 CALI 实验分析

• 批准号: 8362508
• 负责人: Kenneth A Jacobson
• 金额: $ 1.05万
• 依托单位: UNIVERSITY OF CONNECTICUT SCH OF MED/DNT
• 依托单位国家: 美国
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-05-01 至 2012-04-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8362508
• 关键词: Actins; Cell Line; Cell physiology; Cells; Chimeric Proteins; Complement; Dendritic Cells; Filament; Funding; Generations; Grant; Growth; Label; Lasers; Light; Mediating; Microfilaments; Modeling; National Center for Research Resources; Phenotype; Physiological; Principal Investigator; Proteins; Reagent; Research; Research Infrastructure; Resources; Role; Source; Structure; System; Techniques; United States National Institutes of Health; chromophore; cost; knock-down; loss of function; research study; spatiotemporal; virtual

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. Primary support for the subproject and the subproject's principal investigator may have been provided by other sources, including other NIH sources. The Total Cost listed for the subproject likely represents the estimated amount of Center infrastructure utilized by the subproject, not direct funding provided by the NCRR grant to the subproject or subproject staff. Chromophore-assisted laser inactivation (CALI) is a light-mediated technique that offers precise spatiotemporal control of protein inactivation, enabling better understanding of the protein's role in cell function. EGFP has been used effectively as a CALI chromophore, and its cotranslational attachment to the target protein avoids having to use exogenously added labeling reagents. A potential drawback to EGFP-CALI is that the CALI phenotype can be obscured by the endogenous, unlabeled protein that is not susceptible to light inactivation. Performing EGFP-CALI experiments in deficient cells rescued with functional EGFP-fusion proteins permits more complete loss of function to be achieved. We developed a modified lentiviral system for rapid and efficient generation of knockdown cell lines complemented with physiological levels of EGFP-fusion proteins. We demonstrated that CALI of EGFP-CapZbeta increases uncapped actin filaments, resulting in enhanced filament growth and the formation of numerous protrusive structures. We showed that these effects are completely dependent upon knocking down the endogenous protein. To fully interpret these results and also guard against over-interpretation, a quantitative analysis, which build on the Virtual Cell dendritic actin nucleation model, will be developed.

该子项目是利用资源的众多研究子项目之一 由 NIH/NCRR 资助的中心拨款提供。子项目的主要支持 并且子项目的首席研究员可能是由其他来源提供的， 包括其他 NIH 来源。 子项目可能列出的总成本 代表子项目使用的中心基础设施的估计数量， NCRR 赠款不直接向子项目或子项目工作人员提供资金。 发色团辅助激光灭活 (CALI) 是一种光介导技术，可对蛋白质灭活进行精确的时空控制，从而更好地了解蛋白质在细胞功能中的作用。 EGFP 已被有效地用作 CALI 发色团，其与靶蛋白的共翻译连接避免了必须使用外源添加的标记试剂。 EGFP-CALI 的一个潜在缺点是 CALI 表型可能会被不易受光失活影响的内源性未标记蛋白质掩盖。在用功能性 EGFP 融合蛋白拯救的缺陷细胞中进行 EGFP-CALI 实验，可以实现更完全的功能丧失。我们开发了一种改良的慢病毒系统，用于快速有效地生成敲除细胞系，并辅以生理水平的 EGFP 融合蛋白。我们证明了 EGFP-CapZbeta 的 CALI 增加了未加帽的肌动蛋白丝，从而增强了丝的生长并形成了许多突出的结构。我们证明这些效应完全依赖于内源蛋白的敲除。为了充分解释这些结果并防止过度解释，将开发基于虚拟细胞树突状肌动蛋白成核模型的定量分析。