甲型肝炎病毒利用PCBP2促进病毒翻译和复制
Chenxia Xu1,2,3,4,5, Yurui Jiang1,2,3,4,5, Mingshu Wang1,2,3,4,5
1Institute of Veterinary Medicine and Immunology, Sichuan Agricultural University, Chengdu, 611130, China.
Veterinary research
|September 19, 2024
概括
甲型肝炎病毒1型 (DHAV-1) 依赖于多C结合蛋白2 (PCBP2) 进行复制和翻译. 通过特定的分子相互作用,PCBP2增强了DHAV-1的独立翻译和病毒RNA复制.
科学领域:
- 病毒学 病毒学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 甲型肝炎病毒1型 (DHAV-1) 在幼中引起严重的肝炎.
- 皮科纳病毒,包括DHAV-1,由于其有限的编码能力,需要宿主因子来有效复制和翻译.
- 了解宿主病毒相互作用对于破译病毒病原体至关重要.
研究的目的:
- 调查子聚基结合蛋白2 (PCBP2) 在DHAV-1的复制和翻译中的作用.
- 阐明PCBP2影响DHAV-1生命周期的分子机制.
主要方法:
- 在DHAV-1感染期间PCBP2表达的定量分析.
- 生物化RNA拉下测试以确定RNA结合蛋白.
- 在PCBP2域和病毒成分之间的相互作用研究 (IRES,3Dpol).
主要成果:
- 在DHAV-1感染期间,PCBP2的表达上调.
- PCBP2直接与DHAV-1内部核糖体进入部位 (IRES) 的结构域II和III结合,增强翻译.
- PCBP2的KH1域与DHAV-1 3Dpol相互作用,促进病毒RNA复制.
结论:
- 子PCBP2在DHAV-1的翻译和复制中起着至关重要的作用.
- PCBP2充当宿主因子,通过特定的分子相互作用促进DHAV-1的传播.
- 这项研究揭示了一种新的宿主病毒相互作用机制,影响皮科纳病毒的病原性.
相关概念视频
02:28Leaky Scanning
5.1K
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R...
5.1K
01:10Retrovirus Life Cycles
45.7K
Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the...
45.7K
02:33Initiation of Translation
31.7K
Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
31.7K
02:33Retroviruses
12.2K
Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...
12.2K