グリコタンパク質構造のマッピングは,Flaviviridaeの進化史を明らかにする
Jonathon C O Mifsud1, Spyros Lytras2,3, Michael R Oliver2
1Sydney Institute for Infectious Diseases, School of Medical Sciences, The University of Sydney, Sydney, New South Wales, Australia.
Nature
|September 4, 2024
まとめ
研究者は,フラビウイルス族のウイルス性グリコタンパク質を調査し,多様な融合機構と複雑な進化史を明らかにしました. この研究は,ヒトと動物の重要な病原体におけるウイルスの侵入と進化の理解を高めています.
科学分野:
- ウイルス学
- 分子生物学
- 進化生物学
背景:
- ウイルスのグリコプロテインは,エンベロープされたウイルスの侵入と発症に不可欠です.
- 肝炎C,デング熱,ジカウイルスを含むFlaviviridaeファミリーは,グリコプロテインと融合メカニズムを十分に理解していない.
- 多くのフラビウイルスには特定されたグリコタンパク質が欠けていて,その生物学の理解を妨げています.
研究 の 目的:
- フラビウイルス一族全体におけるグリコプロテインを 総合的に調査する.
- フラビウイルスグリコタンパク質の進化史と多様性を特徴づける.
- Flaviviridaeにおける膜融合の分子メカニズムを解明する.
主な方法:
- 遺伝子解析を用いて,グリコタンパク質の分布を研究した.
- タンパク質構造の予測は,グリコタンパク質の構造を分析するために利用されました.
- グリコタンパク質の分布は,ウイルスの系統形成にマッピングされた.
主要な成果:
- ほとんどのフラビウイルスは,オートフラビウイルスEグリコタンパク質に同類するクラスII融合システムを利用する.
- ヘパシウイルス,ペギウイルス,ペスティウイルスは異なるE1E2グリコタンパク質を持ち,新しい融合メカニズムを示唆しています.
- これらの独特のグリコタンパク質は,脊椎動物の宿主感染症と関連しています.
- 進化的分析により,細菌からの遺伝子捕獲と,潜在的種間再結合が明らかになった.
結論:
- この研究は,フラビウイルスのウイルスの融合メカニズムについての理解を深めています.
- フラビウイルスグリコプロテインの複雑な進化の軌道を強調しています
- グリコタンパク質の多様性と進化に関する洞察は,これらのウイルスの生態学に光を当てています.
さらに関連する動画
10:32A Miniaturized Glycan Microarray Assay for Assessing Avidity and Specificity of Influenza A Virus Hemagglutinins
Published on: May 29, 2016
7.9K
08:56Combining Analysis of DNA in a Crude Virion Extraction with the Analysis of RNA from Infected Leaves to Discover New Virus Genomes
Published on: July 27, 2018
11.0K
関連する概念動画
00:56Viral Structure
61.9K
Viruses are extraordinarily diverse in shape and size, but they all have several structural features in common. All viruses have a core that contains a DNA- or RNA-based genome. The core is surrounded by a protective coat of proteins called the capsid. The capsid is composed of subunits called capsomeres. The capsid and genome-containing core are together known as the nucleocapsid.
61.9K
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
00:36Viral Mutations
32.2K
A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...
32.2K
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
02:54Evolutionary Relationships through Genome Comparisons
5.7K
Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
5.7K
02:50Conjugated Proteins
18.2K
Simple proteins and protein complexes contain only amino acids. In contrast, many other proteins, called conjugated proteins, covalently bond with non-protein moieties.
Nucleoproteins are protein complexes that contain nucleic acids, categorized as deoxyribonucleoproteins (DNPs) or ribonucleoproteins (RNPs) respectively. The nucleosome is a typical example of a DNP where nuclear DNA is associated with histone proteins. The major antigen for the Covid-19 virus SARS-CoV is an RNP that is critical...
Nucleoproteins are protein complexes that contain nucleic acids, categorized as deoxyribonucleoproteins (DNPs) or ribonucleoproteins (RNPs) respectively. The nucleosome is a typical example of a DNP where nuclear DNA is associated with histone proteins. The major antigen for the Covid-19 virus SARS-CoV is an RNP that is critical...
18.2K