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Related Concept Videos

Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Diffusion01:12

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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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Mass-Sensitive Particle Tracking to Characterize Membrane-Associated Macromolecule Dynamics
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Diffusion accessibility as a method for visualizing macromolecular surface geometry.

Yingssu Tsai1, Thomas Holton2, Todd O Yeates1,2

  • 1Department of Chemistry and Biochemistry, University of California, Los Angeles.

Protein Science : a Publication of the Protein Society
|July 21, 2015
PubMed
Summary
This summary is machine-generated.

Visualizing macromolecular surfaces is enhanced using diffusion accessibility, a method for calculating surface depth. A new web platform provides this calculation and visualization scripts for clearer 3D perceptions.

Keywords:
LaplacePoisson-Boltzmannbinding sitescomputer graphicsprotein surfacessurface curvature

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Area of Science:

  • Biophysics
  • Computational Biology
  • Scientific Visualization

Background:

  • Conveying 3D spatial features like depth and concavity in 2D images is challenging.
  • Macromolecular visualization benefits from techniques that enhance surface perception.
  • Existing methods for emphasizing surface concavity in macromolecular structures are limited.

Purpose of the Study:

  • To introduce a computational method for calculating diffusion accessibility.
  • To provide a web-based platform for diffusion accessibility calculations.
  • To generate visualization scripts that highlight surface depth in macromolecules.

Main Methods:

  • Solving the Laplace equation for steady-state diffusion.
  • Developing a web-based platform for diffusion accessibility calculations.
  • Generating visualization scripts based on diffusion accessibility values.

Main Results:

  • A functional web platform (http://services.mbi.ucla.edu/DiffAcc/) is now available.
  • The platform calculates diffusion accessibility for macromolecular surfaces.
  • Generated visualizations effectively emphasize surface depth and concavity.

Conclusions:

  • Diffusion accessibility is a valuable metric for enhancing macromolecular surface visualization.
  • The provided web platform democratizes access to diffusion accessibility calculations.
  • This tool aids in clearer perception of three-dimensional structural features in macromolecules.