阻害剤に結合したヒトの5-リポキシゲナーゼ活性化タンパク質の結晶構造
Andrew D Ferguson1, Brian M McKeever, Shihua Xu
1Department of Medicinal Chemistry, Merck Research Laboratories, Rahway, NJ 07065, USA.
まとめ
研究者らは,ルオコトリエン生物合成を阻害する構造的基礎を明らかにした. FLAP阻害体がどのように結合するかを理解することは,炎症性呼吸器系および心血管疾患の治療法を開発するための新しい道を提供します.
科学分野:
- バイオケミストリー バイオケミストリー
- 構造生物学 構造生物学とは
- 薬理学 薬理学とは
背景:
- レウコトリエンは,アラキドン酸から派生した主要な炎症媒介体です.
- レウコトリエンの生物合成は,呼吸器系および心臓血管疾患に関与しています.
- 統合膜タンパク質FLAP (5-リポキシゲナーゼ活性化タンパク質) は,白血球トリエンの生成に不可欠である.
研究 の 目的:
- レウコトリエン生物合成の阻害の構造的メカニズムを解明する.
- 新規のFLAP阻害剤の設計のための構造的基礎を提供すること.
主な方法:
- 構造を決定するために,X線結晶学を用いた.
- 人間のFLAPは,2つの異なる白血球トリエン生物合成阻害剤で複合的に結晶化されました.
- 高解像度 (4.0および4.2アングストーム) の構造が得られた.
主要な成果:
- 結晶構造は,阻害剤が膜に埋め込まれたFLAPのポケットに結合することを明らかにします.
- この結合モードは,阻害剤が基板 (アラキドン酸) がFLAPへのアクセスを阻止する方法を説明します.
- 構造は,FLAPがアラキドン酸を5-リポキシゲナーゼに転送するのを防ぐメカニズムを示しています.
結論:
- 決定された構造は,白血球トリエンの生物合成におけるFLAPの機能に関する重要な洞察を提供します.
- この構造情報は,合理的な薬剤設計の基礎となる.
- FLAPを標的とした治療戦略は,炎症性呼吸器系および心血管疾患の治療のために開発される可能性があります.
関連する概念動画
Enzyme Inhibition
Inhibitors are molecules that reduce enzyme activity by binding to the enzyme. In a normally functioning cell, enzymes are regulated by a variety of inhibitors. Drugs and other toxins can also inhibit enzymes. Some inhibitors bind to the enzyme’s active site, while others inhibit enzymatic activity by binding to other sites on the protein structure.
X-ray Crystallography
The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
Protein and Protein Structure
Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme can...
A protein's shape is critical to its function. For example, an enzyme can...
Gene Families
Gene families consist of groups of genes proposed to have originated from a common ancestor. Typically these arise through events in which a gene or genes are mistakenly duplicated during cell division. Unlike their parent genes (which are subject to selection pressure to maintain function), these gene copies do not need to preserve their sequences and may evolve at a relatively faster rate.
Occasionally these regions can be adapted to take on new roles within the organism, becoming novel genes...
Occasionally these regions can be adapted to take on new roles within the organism, becoming novel genes...
Globular and Fibrous Proteins
Many proteins can be classified into two distinct subtypes - globular or fibrous. These two types differ in their shapes and solubilities.
Globular proteins are also known as spheroproteins and typically are approximately round in shape. They contain a mix of amino acid types and contain differing sequences in their primary structures. Globular proteins have many different functions, such as enzymes, cellular messengers, and molecular transporters. These roles often require the proteins to be...
Globular proteins are also known as spheroproteins and typically are approximately round in shape. They contain a mix of amino acid types and contain differing sequences in their primary structures. Globular proteins have many different functions, such as enzymes, cellular messengers, and molecular transporters. These roles often require the proteins to be...
Cholinergic Antagonists: Chemistry and Structure-Activity Relationship
Cholinergic antagonists bind to cholinergic receptors and limit the effects of acetylcholine and other cholinergic agonists. Based on the specific cholinergic receptor affinity, these antagonists are classified as muscarinic or nicotinic. Anticholinergics interrupt parasympathetic innervations while sympathetic innervations remain uninterrupted. Muscarinic antagonists are also called 'muscarinic antagonists', 'antimuscarinics', or 'parasympatholytics'. Nicotinic antagonists are called...


