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Related Concept Videos

Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
Protein Diffusion in the Membrane01:24

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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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Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...

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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Published on: September 26, 2016

Hindered diffusion in polymeric solutions studied by fluorescence correlation spectroscopy.

Silviya P Zustiak1, Ralph Nossal, Dan L Sackett

  • 1Program in Physical Biology, Eunice Kennedy Shriver National Institute of Child Development, National Institutes of Health, Bethesda, Maryland, USA. zustiaksp@mail.nih.gov

Biophysical Journal
|July 5, 2011
PubMed
Summary
This summary is machine-generated.

Molecular diffusion in cells is complex. This study shows that while crowding affects protein movement, negatively charged molecules significantly hinder diffusion by binding to proteins, impacting cellular processes.

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Area of Science:

  • Biophysics
  • Cellular Biology
  • Physical Chemistry

Background:

  • Understanding molecular diffusion within the crowded and charged cellular environment is crucial for elucidating cellular functions.
  • Previous models often simplified diffusion by considering either crowding or binding effects, but not both simultaneously.

Purpose of the Study:

  • To investigate the hindered diffusion of a model protein, ribonuclease A (RNase), in solutions containing dextrans of varying charges and concentrations.
  • To differentiate the effects of macromolecular crowding and electrostatic binding on protein diffusivity.

Main Methods:

  • Utilized fluorescence correlation spectroscopy (FCS) to measure the diffusion coefficients of RNase.
  • Employed dextrans with different charges (positive, neutral, negative) and concentrations to simulate cellular crowding and binding scenarios.
  • Applied high salt concentrations and ultrafiltration to confirm the electrostatic nature and extent of RNase binding.

Main Results:

  • RNase diffusivity was unaffected by neutral or positively charged dextrans in dilute solutions but was reduced by crowding at higher polymer concentrations.
  • Negatively charged dextrans significantly reduced RNase diffusivity, even at low concentrations (0.4 μM).
  • RNase binding to negative dextrans increased with dextran concentration, plateauing at approximately 80% bound protein, confirming electrostatic interactions.

Conclusions:

  • Macromolecular crowding and electrostatic binding have distinct impacts on molecular diffusion within cellular environments.
  • Negatively charged cellular components can significantly impede protein mobility through electrostatic binding, influencing cellular processes.
  • The model system provides insights into the complex interplay of factors governing diffusion in biological systems.