大型のキナーゼ活性部位を,硬直で重量のある八面体ルテニウム複合体で標的にする
Jasna Maksimoska1, Li Feng, Klaus Harms
1The Wistar Institute and University of Pennsylvania, Department of Chemistry, Philadelphia, Pennsylvania 19104, USA.
Journal of the American Chemical Society
|November 1, 2008
まとめ
研究者らは,大規模なタンパク質キナーゼのATP結合部位を標的とした新しいルテニウム複合体を開発した. Lambda-FL172のような巨大な八面体化合物は,PAK1を効果的に阻害し,キナーゼ阻害剤の設計における新しい戦略を示しています.
科学分野:
- 薬用化学 薬用化学について
- 構造生物学 構造生物学とは
- 無機化学 無機化学とは
背景:
- タンパク質キナーゼをターゲットにすることは,様々な病気の治療に不可欠です.
- キナーゼの大きなATP結合部位は,選択的阻害剤設計に課題をもたらす.
- ルテニウム複合体は,薬物開発のためのユニークな構造および電子特性を提供します.
研究 の 目的:
- 巨大な八面体ルテニウム複合体を用いたタンパク質キナーゼ阻害剤の開発のための新しい戦略を提示する.
- 大量のATP結合部位を持つキナーゼを標的としたルテニウムベースの阻害剤の設計と合成.
- キナーゼ活性部位内のこれらの複合体の結合機構を解明する.
主な方法:
- 既知の阻害物エスカフォールド (NP309) を改変することによって,八面体ルテニウム複合体 (ラムダ-FL172,ラムダ-FL411) の合成.
- PAK1キナーゼとルテニウム複合体Lambda-FL172.2の共結晶化について
- 高解像度コクリスタル構造 (1.65 Å) を決定するX線結晶学.
主要な成果:
- 八面体ルテニウム複合体を用いてGSK3/Pim1阻害剤をPAK1阻害剤に変換した.
- Lambda-FL172の大きな調整球は,PAK1の活性部位に効果的に適合しています.
- コクリスタル構造は,複合体が類似の結合部位を区別するための"ヤードスティック"としてどのように作用するかを明らかにします.
結論:
- 大量で硬直な八面体ルテニウム複合体は,タンパク質キナーゼの大きなATP結合部位を標的とした効果的な支架です.
- このアプローチは,キナーゼ活性部位におけるステリック差異を利用して,選択的阻害剤の設計を可能にします.
- ルテニウム複合体は,新種のキナーゼを標的とした治療法を開発するための有望なプラットフォームです.
関連する概念動画
Transducer Mechanism: Enzyme-Linked Receptors
Enzyme-linked receptors are cell-surface receptors acting as an enzyme or associating with an enzyme intracellularly. They make excellent drug targets. Drugs can bind to the extracellular ligand-binding domain or directly affect their enzymatic domain and alter their activity.
Major types that are helpful drug targets include:
Major types that are helpful drug targets include:
Targets for Drug Action: Overview
Drugs target macromolecules to modify ongoing cellular processes. Primary drug targets include receptors, ion channels, transporters, and enzymes.
Receptors are either membrane-spanning or intracellular proteins, which upon binding a ligand, get activated and transmit the signal downstream to elicit a response. Drugs bind receptors, either mimicking the action of endogenous ligands or blocking the receptor activity to bring about a modified response. Nearly 35% of approved drugs target the G...
Receptors are either membrane-spanning or intracellular proteins, which upon binding a ligand, get activated and transmit the signal downstream to elicit a response. Drugs bind receptors, either mimicking the action of endogenous ligands or blocking the receptor activity to bring about a modified response. Nearly 35% of approved drugs target the G...
Receptor Tyrosine Kinases
Receptor tyrosine kinases or RTKs are membrane-bound receptors that phosphorylate specific tyrosine on protein substrates. RTKs regulate cellular growth, differentiation, survival, and migration. They contain an extracellular ligand binding domain, a transmembrane domain, and a cytosolic tail with intrinsic kinase activity. Several extracellular signaling molecules activate RTKs in one or more ways and relay the signal downstream. Ligands such as platelet-derived growth factor (PDGF) or...
EDTA: Chemistry and Properties
Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
Targeted Cancer Therapies
The targeted cancer therapies, also known as “molecular targeted therapies,” take advantage of the molecular and genetic differences between the cancer cells and the normal cells. It needs a thorough understanding of the cancer cells to develop drugs that can target specific molecular aspects that drive the growth, progression, and spread of cancer cells without affecting the growth and survival of other normal cells in the body.
There are several types of targeted therapies against specific...
There are several types of targeted therapies against specific...
Enzymes
Inside living organisms, enzymes act as catalysts for many biochemical reactions involved in cellular metabolism. The role of enzymes is to reduce the activation energies of biochemical reactions by forming complexes with its substrates. The lowering of activation energies favor an increase in the rates of biochemical reactions.
Enzyme deficiencies can often translate into life-threatening diseases. For example, a genetic abnormality resulting in the deficiency of the enzyme G6PD...
Enzyme deficiencies can often translate into life-threatening diseases. For example, a genetic abnormality resulting in the deficiency of the enzyme G6PD...


