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Diffusion01:12

Diffusion

221.5K
Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
221.5K
Diffusion01:21

Diffusion

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Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
6.5K
The Eukaryotic Promoter Region02:40

The Eukaryotic Promoter Region

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The eukaryotic promoter region is a segment of DNA located upstream of a gene. It contains an RNA polymerase binding site, a transcription start site, and several cis-regulatory sequences.  The proximal promoter region is located in the vicinity of the gene and has cis-regulatory sequences and the core promoter. The core promoter is the binding site for RNA polymerase and is usually located between -35 and +35 nucleotides from the transcription start site. The distal promoter regions are...
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The Eukaryotic Promoter Region02:40

The Eukaryotic Promoter Region

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Facilitated Diffusion01:16

Facilitated Diffusion

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The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
In this process, substrates such as organic compounds and ions interact with a transporter on one side, triggering conformational changes in proteins that enable...
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Anaphase Promoting Complex00:50

Anaphase Promoting Complex

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The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
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Expanding Nanopatterned Substrates Using Stitch Technique for Nanotopographical Modulation of Cell Behavior
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MYCはTOP2Aの拡散を調節し、基質検出と活性を促進する

Donald P Cameron1,2, Kathryn Jackson1, Alessia Loffreda3

  • 1Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden.

Nature communications
|February 9, 2026
PubMed
まとめ
この要約は機械生成です。

オンコプロテインMYCは、細胞内のトポイソメラーゼTOP2Aの拡散を加速する。このメカニズムは、TOP2Aを増加させることによってMYC駆動転写を増強する

キーワード:
MYCTOP2A拡散転写がん治療

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Evaluation of Substrate Ubiquitylation by E3 Ubiquitin-ligase in Mammalian Cell Lysates
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科学分野:

  • 分子生物学
  • 細胞生物学
  • 生化学

背景:

  • トポイソメラーゼは、細胞プロセスに不可欠なDNA超ねじれを解決する。
  • オンコプロテインMYCは、癌性転写中にトポイソメラーゼをリクルートし、刺激する。
  • MYC-TOP2A相互作用の理解は、癌治療標的を明らかにする可能性がある。

研究 の 目的:

  • MYCがTOP2A活性を刺激するメカニズムを解明すること。
  • ヒト細胞におけるTOP2Aの動的調節を調査すること。
  • MYCがTOP2Aの局在と機能にどのように影響するかを決定すること。

主な方法:

  • TOP2A拡散ダイナミクスを観察するための単一分子追跡。
  • TOP2A自己相互作用を評価するためのin vitroアッセイ。
  • TOP2A複合体サイズとクロマチンエンゲージメントを測定するための細胞アッセイ。

主要な成果:

  • TOP2Aは、核小体隔離、転写ハブ、クロマチンの間の動的平衡状態に存在する。
  • MYCは、自己相互作用を制限し、複合体サイズを減少させることによってTOP2Aの拡散を加速する。
  • TOP2A拡散の増加は、基質結合とゲノムワイドクロマチンエンゲージメントを強化する。

結論:

  • MYCによるTOP2A拡散の調節は、その活性を刺激するための重要なメカニズムである。
  • この発見は、癌におけるMYC駆動転写の標的化に関する洞察を提供する。
  • TOP2Aの動的調節は、DNAトポロジー変化に応答する。