関連する実験動画
Updated: Jul 9, 2026

11:13
Identification of Kinase-substrate Pairs Using High Throughput Screening
Published on: August 29, 2015
細胞内細菌の成長は,PKB/AKT1の周りのキナーゼネットワークによって制御されます
Coenraad Kuijl1, Nigel D L Savage, Marije Marsman
1Division of Tumor Biology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands.
Nature
|November 30, 2007
まとめ
新しいキナーゼ阻害剤は,多剤耐性細菌と戦うために宿主経路を標的とする. これらのAKT1阻害剤は,細胞内病原体の増殖を阻害し,サルモネラ・タイフィムリウム (Salmonella typhimurium) やミコバクテリウム・結核 (Mycobacterium tuberculosis) などの感染症に対する新しい戦略を提供します.
科学分野:
- 微生物学 微生物学とは
- 細胞生物学 細胞生物学
- 薬理学 薬理学とは
背景:
- 多剤耐性 (MDR) のバクテリアの増加は,従来の抗生物質を超えた新しい治療戦略を必要とします.
- 既存の抗生物質は主に細菌の経路を標的とし,宿主指向のアプローチは細胞内病原体について未熟のままです.
研究 の 目的:
- ホスト固有の標的を特定し,細胞内細菌病原体に対する新しい治療薬を開発する.
- 細菌の細胞内生存における宿主キナーゼの役割を調査し,病原体操作に対抗するための阻害剤を開発する.
主な方法:
- 自動顕微鏡を用いたヒトキノームのRNA干渉スクリーンを実施し,サルモネッラ・タイフィムリウム (Salmonella typhimurium) の細胞内成長に関与する宿主キナーゼを特定しました.
- 抗生物質特性のキナーゼ阻害剤とその宿主標的を特定するために,相互化学遺伝学のアプローチを使用しました.
- サルモネラチフィムリウムエフェクターSopBによるAKT1の活性化とその下流経路 (PAK4,AS160-RAB14) を調査した.
主要な成果:
- S. typhimuriumの細胞内成長を阻害するいくつかの宿主キナーゼ,特にAKT1 (タンパク質キナーゼB) を特定しました.
- AKT1阻害剤は,MDR Mycobacterium tuberculosisを含む様々なバクテリアの細胞内成長を効果的に防ぐことが実証されました.
- Salmonella typhimuriumがSopB経由でAKT1を活性化させ,宿主経路 (アクチンダイナミクス,ファゴソーム-リゾソーム融合) を操作して細胞内生存することを明らかにした.
結論:
- 主体経路を標的とするキナーゼ阻害剤,特にAKT1は,細胞内病原体に対する有望な新種の抗生物質を表しています.
- バクテリアによって操作されたホスト信号ネットワークをターゲットにすることは,MDR感染を克服するための実行可能な戦略を提供します.
- この研究は,細菌の病原性における重要な宿主キナーゼとその調節体を特定することによって,宿主指向の治療法を発見するための枠組みを提供します.
関連する概念動画
PI3K/mTOR/AKT Signaling Pathway
The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a rapamycin-insensitive companion...
mTOR Signaling and Cancer Progression
The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
The mTOR pathway or the...
cAMP-dependent Protein Kinase Pathways
Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
The JAK-STAT Signaling Pathway
Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as SH2...
Stringent Response in E. coli
Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
Inhibition of Cdk Activity
The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...

