関連する実験動画
Updated: May 16, 2025

13:00
Engineering Antiviral Agents via Surface Plasmon Resonance
Published on: June 14, 2022
2.2K
SARS-CoV-2 ORF6のN-ターミナル膜アンカーを明らかにした
Martí Ninot-Pedrosa1, Gyula Pálfy2, Hafez Razmazma1
1Molecular Microbiology and Structural Biochemistry (MMSB), UMR 5086 CNRS, Lyon 69367, France.
Journal of the American Chemical Society
|May 15, 2025
まとめ
SARS-CoV-2のORF6タンパク質は細胞毒性であり,インターフェロンを阻害する. この研究は,その螺旋構造,N末端経由の膜アンカリング,および,ウイルス病原性を理解するために重要な脂質二層内のオリゴメリック状態を明らかにしています.
科学分野:
- ウイルス学
- 構造生物学
- バイオ物理学
背景:
- 重症急性呼吸器症候群コロナウイルス2 (SARS-CoV-2) は,ORF6を含む補助タンパク質をコードする.
- ORF6は強力なインターフェロン阻害剤であり,高度に細胞毒性のウイルスタンパク質です.
- ORF6の構造と膜相互作用を理解することは,その病原性の役割の鍵です.
研究 の 目的:
- SARS-CoV-2 ORF6タンパク質の構造,オリゴメリック状態,膜相互作用メカニズムを解明する.
- ORF6の形状と膜結合におけるその役割を特徴づける.
主な方法:
- 化学シフトROSETTAを含む核磁気共振 (NMR) スペクトロスコーピー
- 分子力学シミュレーション
- プロテオリポソームにおけるクロスリンク実験とパラマグネティック・スピン・ラベリング.
主要な成果:
- ORF6は,堅固なN末端と柔軟なC末端を持つタンパク質の直線α螺旋構造を採用している.
- ORF6は,おそらく反並列の配置で,脂質バイレイヤ内でオリゴーマーを形成する.
- アンフィパティック・ヘリクスは膜と広範囲に相互作用し,N端の残留物がそれを固定する.
結論:
- SARS-CoV-2 ORF6は統合されたモノトープ膜タンパク質として機能する.
- N末端領域は膜の固定と相互作用に欠かせない.
- これらの発見は,ORF6の細胞毒性とウイルス病原性に関する構造的な洞察を提供します.
さらに関連する動画
関連する概念動画
Tail-anchoring of Proteins in the ER Membrane
3.0K
Tail-anchored, or TA, proteins are estimated to make up to 3-5% of membrane proteins found in the eukaryotic cell. Such proteins have a single transmembrane domain located approximately 30 amino acid residues upstream from the C-terminal end. As a result, the signal recognition particle (SRP) cannot guide a TA protein to the ER membrane for cotranslational insertion. Hence, they are integrated into the ER membrane post-translationally using their C-terminal end as the anchor. TA proteins...
3.0K
GPI Anchoring of Proteins in the ER Membrane
3.9K
GPI-anchoring is a post-translational, reversible protein modification that is ubiquitous in eukaryotes. Such proteins are primarily present on the exoplasmic leaflet of the plasma membrane.
GPI-anchor structure
A sequence of 11 enzymatic reactions results in the synthesis of the complete GPI anchor consisting of a hydrophobic and a hydrophilic portion. The hydrophobic portion comprises phosphatidylinositol, while the hydrophilic part comprises polar groups like phosphoethanolamine,...
GPI-anchor structure
A sequence of 11 enzymatic reactions results in the synthesis of the complete GPI anchor consisting of a hydrophobic and a hydrophilic portion. The hydrophobic portion comprises phosphatidylinositol, while the hydrophilic part comprises polar groups like phosphoethanolamine,...
3.9K
Leaky Scanning
5.0K
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...
5.0K
Nucleic Acid Structure
5.9K
The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms a 5′ to 3′ phosphodiester linkage.
DNA Structure
DNA...
DNA Structure
DNA...
5.9K
Antibody Structure
58.4K
Overview
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
58.4K
Lipids as Anchors
5.5K
In the plasma membrane, the lipids forming the bilayer can also act as an anchor to tether proteins to the membrane. The three main types of lipid anchors found in eukaryotes are – prenyl groups, fatty acyl groups, and glycosylphosphatidylinositol or GPI groups. Prenyl and fatty acyl groups act as anchors on the cytosolic surface of the membrane, whereas GPI anchors proteins on the extracellular side.
The carboxy-terminal of most of the prenylated proteins, such as Ras proteins, contains...
The carboxy-terminal of most of the prenylated proteins, such as Ras proteins, contains...
5.5K

