通过增强NS5B聚合酶功能,PKM2促进了古典猪瘟病毒的复制
Mengzhao Song1, Shanchuan Liu1, Yan Luo1
1College of Veterinary Medicine, Northwest A&F University, Yangling 712100, China.
Viruses
|May 28, 2025
概括
酸激酶M2 (PKM2) 通过与病毒NS5B蛋白相互作用,增强病毒RNA合成和传播,支持古典猪瘟病毒 (CSFV) 复制. 这项研究揭示了PKM2是关键的前病毒宿主因子.
科学领域:
- 病毒学 病毒学
- 分子生物学分子生物学
- 代谢调节 代谢调节 代谢调节
背景情况:
- 病毒重新编程宿主代谢以进行复制.
- 酸盐激酶M2 (PKM2) 是一种具有非正规作用的糖解酶.
- 在古典猪瘟病毒 (CSFV) 感染中PKM2的作用尚不清楚.
研究的目的:
- 调查PKM2在CSFV复制中的作用.
- 为了确定PKM2和CSFV蛋白之间的相互作用.
- 阐明PKM2影响病毒基因组复制的机制.
主要方法:
- 在PK-15细胞和小猪模型中的CSFV感染.
- PKM2表达分析 (体外和体内).
- 关于PKM2的淘汰和过度表达的研究.
- 共同免疫沉降和GST-pulldown测试以确定蛋白质相互作用.
- 双露西法酶记者测试以评估NS5B聚合酶活性.
- 病毒复制的时间分析.
主要成果:
- 感染CSFV会调节PKM2的表达,从而形成一种前病毒性环境.
- 抑制PKM2会减少CSFV的扩散;过度表达PKM2会增加CSFV的扩散.
- PKM2与CSFV NS5B蛋白直接相互作用.
- PKM2调节NS5BRNA依赖RNA聚合酶 (RdRp) 的活性,其耗尽减少了50%的活性.
- 在早期的复制周期中,PKM2增强了CSFVRNA合成.
结论:
- PKM2是CSFV的前病毒性宿主因子.
- PKM2直接与CSFV NS5B结合,增强其RdRp活动.
- PKM2桥梁是代谢适应和病毒基因组复制的主机.
- 这项研究揭示了一种新的CSFV与宿主相互作用机制,其中涉及一种糖解酶.
相关概念视频
Leaky Scanning
5.2K
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...
5.2K
RNA Polymerase II Accessory Proteins
9.6K
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
9.6K
Bacterial RNA Polymerase
30.6K
Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
30.6K
Eukaryotic RNA Polymerases
24.8K
RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
All three eukaryotic RNAPs require specific transcription factors, of which the...
All three eukaryotic RNAPs require specific transcription factors, of which the...
24.8K
Translesion DNA Polymerases
10.2K
Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
10.2K
Initiation of Translation
34.6K
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...
34.6K


