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Related Concept Videos

Diffusion01:12

Diffusion

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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...
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Diffusion01:21

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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...
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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 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.
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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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MYC modulates TOP2A diffusion to promote substrate detection and activity.

Donald P Cameron1,2, Kathryn Jackson1, Alessia Loffreda3

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

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This summary is machine-generated.

The oncoprotein MYC accelerates the diffusion of topoisomerase TOP2A in cells. This mechanism enhances MYC-driven transcription by increasing TOP2A

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Topoisomerases resolve DNA supercoiling crucial for cellular processes.
  • The oncoprotein MYC recruits and stimulates topoisomerases during oncogenic transcription.
  • Understanding MYC-TOP2A interactions could reveal cancer therapeutic targets.

Purpose of the Study:

  • To elucidate the mechanism by which MYC stimulates TOP2A activity.
  • To investigate the dynamic regulation of TOP2A in human cells.
  • To determine how MYC influences TOP2A localization and function.

Main Methods:

  • Single molecule tracking to observe TOP2A diffusion dynamics.
  • In vitro assays to assess TOP2A self-interaction.
  • Cellular assays to measure TOP2A complex size and chromatin engagement.

Main Results:

  • TOP2A exists in a dynamic equilibrium between nucleolar sequestration, transcription hubs, and chromatin.
  • MYC accelerates TOP2A diffusion by limiting self-interaction and reducing complex size.
  • Increased TOP2A diffusion enhances substrate binding and genome-wide chromatin engagement.

Conclusions:

  • MYC's regulation of TOP2A diffusion is a key mechanism for stimulating its activity.
  • This finding provides insights into targeting MYC-driven transcription in cancer.
  • The dynamic regulation of TOP2A is responsive to DNA topology changes.