細胞に浸透するペプチドの膜環境での可逆活性化
Denise K Schach1, William Rock1, Johannes Franz1
1Department of Molecular Spectroscopy, Max Planck Institute for Polymer Research , Mainz 55128, Germany.
Journal of the American Chemical Society
|September 4, 2015
まとめ
細胞に浸透するペプチド (CPP) は薬剤の投与可能性を秘めているが,エンドソーマルトラッピングに直面している. GALAペプチドは,ウイルスの融合を模倣し,低pHで膜を破壊することで,効果的にエンドソームから逃れ,薬物投与の安全性と効率性を高めます.
科学分野:
- 生物化学
- 分子生物学
- 薬物投与システム
背景:
- 細胞に浸透するペプチド (CPP) は,治療用分子の媒介体として研究されている.
- CPPによる薬剤投与の有効性を制限する.
- GALAのようなウイルスの融合を模倣するペプチドは,pHで誘発された内分体脱出メカニズムを提供します.
研究 の 目的:
- GALAペプチドのpH誘発による膜破壊と内体脱出能力を調査する.
- GALAの活性に対する脂質二層の性質の影響を決定する.
- 脂質膜内のGALAの機能の可逆性と安定性を評価する.
主な方法:
- GALAが誘発した脂質小胞の破壊をモニターするために,漏出測定法を使用した.
- 脂質二層の曲率半径がGALAの運動に与える影響を調査した.
- 膜挿入後のGALAのpH反応性と可逆性を評価した.
主要な成果:
- 脂質二層の曲率半径は,GALA誘発の漏れに最小の影響を及ぼしました.
- GALAは脂質膜に挿入された後,持続的なpH反応を示した.
- このペプチドは,脂質環境内で不活性状態と活性状態の間の可逆的な切り替えを示した.
結論:
- GALAペプチドは,pHに依存した方法で,エンドソーム膜を効果的に破壊する.
- GALAの機能は頑丈でリバーシブルで 脂質膜内では曲線に左右されない.
- GALAベースの戦略は,薬物投与における安全で効率的な内分体脱出に希望を示しています.
関連する概念動画
Insertion of Single-pass Transmembrane Proteins in the RER
18.9K
Integral membrane proteins are proteins adhered to the lipid bilayer of a cell organelle or membrane. They can be of two types: transmembrane integral proteins that span the lipid bilayer and monotopic proteins that are attached to either side of the membrane but do not pass through it.
Integral transmembrane proteins possess transmembrane and extra membrane domains. The transmembrane domains are primarily made of 20-25 hydrophobic amino acids arranged in a helical secondary confirmation. These...
Integral transmembrane proteins possess transmembrane and extra membrane domains. The transmembrane domains are primarily made of 20-25 hydrophobic amino acids arranged in a helical secondary confirmation. These...
18.9K
Cell-surface Signaling
57.8K
Hormones—or any molecule that binds to a receptor, known as a ligand—that are lipid-insoluble (water-soluble) are not able to diffuse across the cell membrane. In order to be able to affect a cell without entering it, these hormones bind to receptors on the cell membrane. When a first messenger, a hormone, binds to a receptor, a signal cascade is set off, causing second messengers, proteins inside the cell, to become activated, resulting in downstream effects.
57.8K
Rab Proteins
5.4K
Rab proteins constitute the largest family of monomeric GTPases, of which 70 members are present in humans. Rab proteins and their effectors regulate consecutive stages of vesicle transport such as vesicle transport, docking, and fusion to the correct recipient membrane.
Rab proteins switch between a cytosolic, GDP-bound inactive state and a membrane-anchored, GTP-bound active state. By themselves, Rabs show slow rates of GDP/GTP exchange and GTP hydrolysis. Thus, Rab proteins are considered...
Rab proteins switch between a cytosolic, GDP-bound inactive state and a membrane-anchored, GTP-bound active state. By themselves, Rabs show slow rates of GDP/GTP exchange and GTP hydrolysis. Thus, Rab proteins are considered...
5.4K
Receptor-mediated Endocytosis
113.5K
Overview
113.5K
Receptor-mediated Endocytosis
12.0K
Receptor-mediated endocytosis is when bulk amounts of specific molecules are imported into a cell after binding to cell surface receptors. The molecules bound to these receptors are taken into the cell through inward folding of the cell surface membrane, which is eventually pinched off into a vesicle within the cell. Structural proteins, such as clathrin, coat the budding vesicle.
Clathrin-Mediated Endocytosis of LDL
One well-characterized example of receptor-mediated endocytosis is the...
Clathrin-Mediated Endocytosis of LDL
One well-characterized example of receptor-mediated endocytosis is the...
12.0K
GPI Anchoring of Proteins in the ER Membrane
5.9K
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,...
5.9K


