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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...
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Probing High-density Functional Protein Microarrays to Detect Protein-protein Interactions
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Diffusing colloidal probes of protein-carbohydrate interactions.

Shannon L Eichmann1, Gulsum Meric, Julia C Swavola

  • 1Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|January 22, 2013
PubMed
Summary
This summary is machine-generated.

This study quantifies protein-polysaccharide interactions using colloidal probes and microscopy. Increasing glucose concentration weakens specific binding between Concanavalin A and dextran, revealing insights into molecular interactions.

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Area of Science:

  • Biophysics
  • Materials Science
  • Surface Chemistry

Background:

  • Understanding specific protein-polysaccharide interactions is crucial for various biological and material applications.
  • Quantifying the influence of competing molecules on these interactions remains a challenge.

Purpose of the Study:

  • To investigate the effect of a competing monosaccharide (glucose) on specific protein-polysaccharide interactions.
  • To quantify the binding behavior and forces between Concanavalin A (ConA) and dextran using colloidal probe measurements.
  • To establish the relationship between potentials of mean force and binding characteristics.

Main Methods:

  • Utilized diffusing colloidal probe measurements combined with integrated evanescent wave and video microscopy.
  • Monitored three-dimensional Brownian motion of ConA-coated colloids interacting with dextran-functionalized surfaces.
  • Analyzed particle trajectories to determine binding lifetimes, isotherms, and potentials of mean force.

Main Results:

  • Observed a decrease in specific ConA-dextran binding with increasing glucose concentration.
  • Modeled the net interaction potential as a superposition of short-range repulsion and longer-range attraction, influenced by glucose.
  • At high glucose concentrations (>100 mM), only non-specific repulsion was detected, similar to control experiments with Bovine Serum Albumin (BSA).

Conclusions:

  • Demonstrated the first quantitative link between potentials of mean force and the binding behavior of ConA-colloids on dextran surfaces using optical microscopy.
  • Validated the role of glucose as a competitive inhibitor weakening specific ConA-dextran interactions.
  • Provided a detailed understanding of the forces governing these multivalent, specific interactions.