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Updated: Jul 14, 2026

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Identification of Kinase-substrate Pairs Using High Throughput Screening
Published on: August 29, 2015
タンパク質キナーゼCの主な基質の刺激に依存したミリスチロチル化
A A Aderem1, K A Albert, M M Keum
1Rockefeller University, New York, New York 10021.
Nature
|March 24, 1988
まとめ
バクテリアのリポポリサッカリド (LPS) は,タンパク質キナーゼC (PKC) 基板をミリスチル化することによって,マクロファージの反応を誘発する. このミリスチル化は,タンパク質を細胞膜に標的とし,LPS誘発の細胞信号伝達を媒介する可能性があります.
科学分野:
- 免疫学 免疫学とは
- 細胞生物学 細胞生物学
- バイオケミストリー バイオケミストリー
背景:
- バクテリアのリポポリサッカリド (LPS) は,マクロファージのような免疫細胞を活性化する,グラム陰性細菌の重要な成分です.
- LPSはマクロファージの機能に大きく影響し,タンパク質とメタボライトの放出を促進しますが,その背後にある分子メカニズムは不明です.
- 以前の研究では,68Kタンパク質を含むマクロファージタンパク質のLPS誘発のミリストイレーションが特定されました.
研究 の 目的:
- LPSがマクロファージの分泌反応を誘発する分子メカニズムを調査する.
- マクロファージに含まれる68Kミリスチル化タンパク質を特定し,特徴づけること.
- LPS媒介の細胞シグナル伝達におけるタンパク質ミリストイレーションの役割を調査する.
主な方法:
- マクロファージのタンパク質分析は,ミリストイレーションを検出する技術を用いて行われます.
- 既知の細胞基板と68Kミリストイラ化タンパク質の比較.
- タンパク質の局所化を決定するサブセルラー分断.
主要な成果:
- マクロファージの68Kミリスチル化タンパク質は,タンパク質キナーゼC (PKC) の既知の基板である80/87Kタンパク質に類似または同一であると特定されています.
- このミリスチル化PKC基板は,細胞膜分数と定量的に関連していることが判明しました.
- LPS刺激は,マクロファージにおけるこの特定のPKC基板のミリスチル化を促進する.
結論:
- LPSによる80/87K PKC基板のミリスチル化は,このタンパク質をマクロファージ膜に標的にする重要なステップとして機能する可能性があります.
- この膜の局所化は,LPS誘発の刺激-応答結合のための信号伝導経路の重要な構成要素であると提案されています.
- この経路を理解することで,グラム陰性細菌の免疫相互作用とマクロファージの活性化に関する洞察が得られます.
関連する概念動画
Protein Kinases and Phosphatases
Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
Protein Kinases and Phosphatases
Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
Amplifying Signals via Enzymatic Cascade
When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze the...
MAPK Signaling Cascades
Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
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,...
Calmodulin-dependent Signaling
Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...

