Defining the role of Host Hsp70 Subnetworks in Dengue Virus Replication

确定主机Hsp70子网在登革病毒复制中的作用 摘要：病毒蛋白的折叠和动态平衡完全依赖于宿主细胞的机制。在这里我们 确定登革病毒(DENV)对Hsp70伴侣和Hsp70的复杂网络的依赖性 辅助伴侣调节病毒生命周期的不同步骤。我们发现胞质中的几种Hsp70亚型 在病毒生命周期的多个阶段都需要，以防止病毒蛋白降解，促进病毒粒子组装 并支持病毒的酶功能。在每个步骤中，Hsp70功能由不同的子网络指定 辅助因子，称为DNAJ和NEF，在每一步调节Hsp70的作用和定位。我们 假设DNAJ和NEF的组合决定了特定的细胞位置、底物 Hsp70在病毒复制中的特异性和下游效应。我们建议对该机制进行定义 以及Hsp70亚网络在DENV复制中的作用 结合生化和细胞生物学实验进行分析。具体来说，我们建议：(1)界定 Dna Js在DENV复制中的机制和作用；(2)剖析Hsp70的作用和机制 DENV复制中的Nef和(3)定义了以Bag6为中心的网络的限制机制。 定义DENV复制的不同步骤所需的守护器子网络将提供新的见解 病毒感染的细胞生物学和分子机制的关键方面。重要的是，Hsp70提供了一个 对抗病毒药物敏感的结节，因为抑制Hsp70循环的化合物通过 对寄主的毒性可以忽略不计。因此，我们的工作将确定药物抗病毒干预的新靶点 并揭示病毒限制的意想不到的细胞机制。

Defining the role of Host Hsp70 Subnetworks in Dengue Virus Replication Abstract: Viral protein folding and homeostasis depends entirely on the machinery of the host cell. Here we define the dependence of Dengue virus (DENV) on the complex network of Hsp70 chaperones and cochaperones which mediate distinct steps of the virus life cycle. We find that several cytosolic Hsp70 isoforms are required at multiple steps of the viral life cycle to prevent viral protein degradation, promote virion assembly and support viral enzyme function. At each step, Hsp70 function is specified by distinct subnetworks of cofactors, called DnaJs and NEFs, that modulate Hsp70 action and localization at each step. We hypothesize that combinations of DnaJs and NEFs dictate the specific cellular locations, substrate specificities and downstream effectors of Hsp70 in viral replication. We propose to define the mechanism and function of Hsp70 subnetworks in DENV replication through the integration of genetic and proteomic analyses with biochemical and cell biological experiments. Specifically we propose to: (1) Define the mechanism and function of DnaJs in DENV replication; (2) Dissect the role and mechanism of Hsp70 NEFs in DENV replication and (3) Define the mechanism of restriction by the Bag6-centered network. Defining the chaperone subnetworks required for distinct steps of DENV replication will provide new insights into key aspects of the cell biology and molecular mechanism of viral infection. Importantly, Hsp70 provides a susceptible node for antiviral drugs, since compounds inhibiting the Hsp70 cycle blocks DENV infection with negligible toxicity to the host. Our work will thus identify novel targets for pharmacological antiviral intervention and uncover unanticipated cellular mechanisms for viral restriction.