Mechanisms of Viral DNA Packaging

病毒 DNA 包装机制

基本信息

批准号：
8964700
负责人：
CARLOS Jose BUSTAMANTE
金额：
$ 52.42万
依托单位：
UNIVERSITY OF CALIFORNIA BERKELEY
依托单位国家：
美国
项目类别：
财政年份：
2004
资助国家：
美国
起止时间：
2004-07-01 至 2017-08-31
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/8964700
关键词：
ATP Hydrolysis ATP Synthesis Pathway ATP phosphohydrolase Adenoviruses Affect Bacteriophages Behavior Biochemical Biological Biological Assay Biological Models Capsid Cell physiology Cells Chemicals Collaborations Communication Complex Couples Coupling DNA DNA Packaging Double Stranded DNA Virus Electrostatics Elements Event Family member Fluorescence Funding Generations Genetic Genome Geometry Head Herpesviridae Housing Human Hybrids In Vitro Individual Kinetics Laboratories Light Maps Measures Mechanics Mediating Microscope Modeling Molecular Molecular Motors Monitor Motor Movement Mutagenesis Nature Nucleic Acids Pathway interactions Periodicity Phenotype Play Process Property Proteins Regulation Resolution Role Rotation Signal Transduction Stress System Tail Techniques Therapeutic Intervention Time Viral Viral Genome Viral Packaging Virus Virus Diseases Weight-Bearing state Work base biophysical properties density drug development ds-DNA instrumentation laser tweezer mutant next generation operation polypeptide public health relevance research study response segregation self assembly single molecule viral DNA

项目摘要

DESCRIPTION (provided by applicant): During their self-assembly many bacteriophages and a number of eukaryotic viruses - including human herpesviruses and adenoviruses - package their double-stranded DNA genomes into pre-formed capsids by the action of a powerful ATP-dependent motor. Since it is believed that these viruses employ similar mechanisms to package DNA, the genome packaging process is a promising target for broad-spectrum anti- viral drug development. The packaging motor of bacteriophage 29 is an ideal model system to investigate viral packaging due to a robust in-vitro packaging assay and extensive genetic, biochemical, structural, and single-molecule characterizations. Since this motor is comprised of a pentameric ring of ATPases that belong to the ASCE superfamily of ring NTPases, its study will also shed light on the operation of other members of this family that are responsible for a large number of cellular functions, such as ATP synthesis, chromosomal segregation, duplex unwinding, and protein unfolding. Our previous single-molecule studies allow us to build a comprehensive mechanochemical model for the  29 packaging motor and provide us with a unique opportunity to tackle fundamental mechanistic questions regarding motor operation with unprecendeted detail. In this application, we focus on the physical basis for the high degree of coordination and exquisite regulation observed in this motor. Specifically, we propose to: (1) dissect the mechanism of intersubunit coordination by monitoring wild-type motors under stressed conditions and mutant motors with deficient coordination phenotypes; (2) characterize the nature and strength of different types of contacts made between the DNA and the motor and the roles of these contacts in motor operation; (3) map the communication pathway between the DNA-filled capsid and the packaging ATPase and correlate the conformational dynamics of the motor complex to its packaging behavior. To carry out these studies, we will take advantage of state-of-the-art single-molecule instrumentation housed in our laboratory, including high-resolution dual-trap optical tweezers and a next- generation fluorescence-force hybrid microscope. Results of single-molecule biophysical measurements will be corroborated with genetic, biochemical, and structural studies through established collaborations. These interdisciplinary efforts will bring us closer toward a complete understanding of the viral packaging process and provide new opportunities for therapeutic intervention of viral infection.

描述（由适用提供）：在自组装中，许多细菌噬细胞和许多真核病毒（包括人疱疹病毒和腺病毒）通过强大的ATP依赖电机的作用将其双链DNA基因组包装成预先形成的衣壳中。由于人们认为这些病毒员工与包装DNA相似的机制，因此基因组包装过程是广谱抗病毒药物开发的有望目标。细菌的包装电机29是一个理想的模型系统，可以研究病毒包装，这是由于强大的体外包装测定法和广泛的遗传，生化，结构和单分子特征。由于该电动机由属于RING NTPases的ASCE超家族的ATPases的五聚室环组成，因此其研究还将阐明该家族其他成员的运行，这些操作负责大量的细胞功能，例如ATP融合，染色体分离，duplex，duplex suppeining和Protinein nofein和蛋白质。我们以前的单分子研究使我们能够为29包装电机构建一个综合的机械模型，并为我们提供了一个独特的机会，可以用未经验证的细节来解决有关电机操作的基本机械问题。在此应用中，我们专注于在该电动机中观察到的高度协调和独家调节的物理基础。具体而言，我们建议：（1）通过在应力条件下监测野生型电动机和具有明确协调表型的突变电动机来剖定亚基间协调的机制；（2）表征DNA与电机之间不同类型的接触的性质和强度以及这些接触在运动操作中的作用；（3）绘制充满DNA填充的衣壳和包装ATPase之间的通信途径，并将电动机复合物的构象动态与其包装行为相关联。为了进行这些研究，我们将利用实验室中容纳的最先进的单分子仪器，包括高分辨率的双陷阱光学镊子和下一代荧光型混合显微镜。单分子生物物理测量结果将通过既定的合作来证实遗传，生化和结构研究。这些跨学科的努力将使我们更加仔细地了解病毒包装过程，并为病毒感染的治疗干预提供新的机会。

项目成果

期刊论文数量（15）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

The elongation rate of RNA polymerase determines the fate of transcribed nucleosomes.

DOI：
10.1038/nsmb.2164
发表时间：
2011-11-13
期刊：
Nature structural & molecular biology
影响因子：
16.8
作者：
通讯作者：

Unraveling the Thousand Word Picture: An Introduction to Super-Resolution Data Analysis.

DOI：
10.1021/acs.chemrev.6b00729
发表时间：
2017-06-14
期刊：
Chemical reviews
影响因子：
62.1
作者：
Lee A;Tsekouras K;Calderon C;Bustamante C;Pressé S
通讯作者：
Pressé S

Full molecular trajectories of RNA polymerase at single base-pair resolution.

DOI：
10.1073/pnas.1719906115
发表时间：
2018-02-06
期刊：
Proceedings of the National Academy of Sciences of the United States of America
影响因子：
11.1
作者：
Righini M;Lee A;Cañari-Chumpitaz C;Lionberger T;Gabizon R;Coello Y;Tinoco I Jr;Bustamante C
通讯作者：
Bustamante C

Cotemporal Single-Molecule Force and Fluorescence Measurements to Determine the Mechanism of Ribosome Translocation.

同期单分子力和荧光测量以确定核糖体易位的机制。