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Amplifying Signals via Enzymatic Cascade01:22

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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...
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Once a ligand binds to a receptor, the signal is transmitted through the membrane and into the cytoplasm. The continuation of a signal in this manner is called signal transduction. Signal transduction only occurs with cell-surface receptors, which cannot interact with most components of the cell, such as DNA. Only internal receptors can interact directly with DNA in the nucleus to initiate protein synthesis. When a ligand binds to its receptor, conformational changes occur that affect the...
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The physiological function of a cell and cellular communication are outcomes of a range of extrinsic signals, intracellular signaling pathways, and cellular responses. No two cell types express the same repertoire of signaling components. Receptors are highly selective for their cognate ligands, but once activated, they can alter multiple cellular processes such as DNA transcription, protein synthesis, and metabolic activity. 
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Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
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Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
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A signaling cascade is a series of events that facilitates the transmission of information within or between cells, culminating in a targeted response in the recipient cell. As chemical messengers, hormones are pivotal in initiating and modulating these intricate signaling cascades based on their solubility.
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Updated: Jan 15, 2026

Mimicking the Function of Signaling Proteins: Toward Artificial Signal Transduction Therapy
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分子検出のための動力的にプログラムされたシグナリングカスケード

Guichi Zhu1, Dominic Lauzon2, Carl Prévost-Tremblay3

  • 1Institut de Génie Biomédical, Département de Pharmacologie et Physiologie, Université de Montréal, Montréal, Quebec H3T 1J4, Canada.

Journal of the American Chemical Society
|October 16, 2025
PubMed
まとめ

この研究は,DNAベースのシグナリングカスケードを導入し,プログラム反応運動は信号出力を強化します. このバイオインスピレーションによるシステムは 分子の迅速な検出を可能にし,家庭での治療薬のモニタリングに適応することができます.

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Plasmid-derived DNA Strand Displacement Gates for Implementing Chemical Reaction Networks
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Plasmid-derived DNA Strand Displacement Gates for Implementing Chemical Reaction Networks

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科学分野:

  • 合成生物学
  • 化学動力学
  • 分子工学

背景:

  • 細胞のシグナリングカスケードは ホメオスタシスの刺激を効率的に処理します
  • バイオインスピレーションによる化学システムは 合成生物学,コンピューティング,薬物投与,バイオセンシングの応用として 登場しています
  • プログラムされた熱力学は研究されているが, バイオインスピレーションカスケードに対する 運動プログラミングの影響は十分に研究されていない.

研究 の 目的:

  • DNAベースのシグナリングカスケードの性能に対する運動プログラミングの効果を調査する.
  • 特定の分子の濃度を測定するためのモジュール式DNAカスケードを開発する.
  • カスケードが様々な分析物質を検出し,診療所での診断を可能にすることを実証する.

主な方法:

  • DNA化学のモジュラリティと プログラム性を活用しました
  • 4つのモジュール (入力,受容器,プロセッサ,出力) のシグナリングカスケードを設計した.
  • 分子相互作用の固有の速度定数を特徴づけ,シミュレーションと実験を行った.

主要な成果:

  • シグナリングカスケードの速度,増強,感度を大幅に向上させることを実証した.
  • 4つの異なる分子 (小分子とタンパク質) を検出するためにカスケードを順応させました.
  • 治療薬モニタリング (TDM) のための高速で一段階の電気化学センサーのカスケードの可能性を示しました.

結論:

  • シグナルキャスケードパフォーマンスを最適化するための強力な戦略です.
  • 開発されたDNAベースのカスケードは,多用途で,モジュール化され,様々なセンシングアプリケーションに適応できます.
  • このアプローチは複雑な化学処理を 迅速で単一の段階の反応に 簡素化できます