HIVカプシドのヘクサアメリカン構成要素のX線構造
Owen Pornillos1, Barbie K Ganser-Pornillos, Brian N Kelly
1Department of Cell Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.
Cell
|June 16, 2009
まとめ
研究者らは,HIVカプシドタンパク質ヘクサマーの原子構造を決定し,ウイルス組成と潜在的な薬物標的の洞察を明らかにした. この研究は,レトロウイルスのカプシド形成と抑制戦略の理解を前進させる.
科学分野:
- 構造生物学 構造生物学とは
- ウイルス学 ウイルス学 ウイルス学
- バイオケミストリー バイオケミストリー
背景:
- ヒト免疫不全ウイルス (HIV) のカプシドは,ウイルスのゲノム包装と宿主細胞の侵入に不可欠です.
- HIVカプシドは,CAタンパク質のヘクサマーとペンタマーから作られたフルレンの円構造である.
研究 の 目的:
- 溶解性,組み立てに適したCAヘクサマーの原子解像度構造を決定する.
- HIVカプシドの組立と曲線の基礎となる分子メカニズムを解明する.
- カプシド集合阻害剤の潜在的な標的を特定する.
主な方法:
- 溶解性,組み立てに適したCAヘクサマーを分離する.
- 高解像度の構造モデルを導出するためのX線結晶学.
- タンパク質ドメインの移動性と水分化インターフェースの分析.
主要な成果:
- 原子解像度でCAヘクサマーの4つの結晶学的に独立したモデルが決定されました.
- 構造は,硬いN端末ドメインコアと移動可能なC端末ドメインリングを明らかにします.
- 高度に水分化されたインターフェースは,ヘクサマー形成と準等価な相互作用を安定させます.
結論:
- C末端ドメインの移動性は,HIVカプシドの格子における可変曲線の生成に極めて重要です.
- これらの構造的特徴を理解すると,カプシド組立抑制の基礎が明らかになる.
- この発見は,新しい抗HIV療法のための構造ベースの薬剤設計を容易にする.
関連する概念動画
The DNA Helix
130.1K
Overview
130.1K
Viral Structure
59.2K
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.
59.2K
Protein Complex Assembly
12.5K
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Many viruses self-assemble into a fully functional unit using the infected host cell to...
12.5K
The Nucleosome Core Particle
12.2K
Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
The paradox
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their main responsibility is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. While on the other hand, they must allow polymerase enzymes to access DNA...
The paradox
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their main responsibility is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. While on the other hand, they must allow polymerase enzymes to access DNA...
12.2K
The DNA Helix
19.9K
Deoxyribonucleic acid, or DNA, is the genetic material responsible for passing traits from generation to generation in all organisms and most viruses. DNA is composed of two strands of nucleotides that wind around each other to form a spring-like structure called a double helix. However, the double helix is not perfectly symmetrical. Instead, there are regularly occurring grooves in the structure. The major groove occurs where the sugar-phosphate backbones are relatively far apart. This space...
19.9K
The Nucleosome Core Particle
2.6K
Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...
2.6K


